Contrast agent

The present invention relates to novel contrast media, more particularly to novel gas-containing or gas-producing contrast media for use in diagnostic imaging.

It is well known that ultrasound imaging is a potentially useful diagnostic tool, for example in the examination of the vascular system (especially in cardiography) and the microcirculation part of the tissue vascular network. A variety of contrast media have been proposed to enhance the acoustic images thus obtained, including particulate suspensions, liquid droplet emulsions, gas bubbles, and gas or liquid capsules. It is generally accepted that low-density contrast media that are easily compressible are particularly effective in the acoustic reflected scattering they generate, and therefore, great interest has been shown in the preparation of gas-containing or gas-generating systems.

Initial studies involving free gas bubbles generated by cardiac injection of physiologically acceptable substances in the body have shown the potential effectiveness of such bubbles as contrast agents in electrocardiography; however, such techniques are severely limited in practice by the short survival of free bubbles. Therefore, methods of gas bubble stabilization for electrocardiography and other studies, such as emulsifiers, oils, thickeners or sugars, or packing or wrapping gas or its precursor in various polymeric systems such as porous gas-containing polymeric microparticles or gas microparticles have been of interest. , coated with polymeric sheaths.

Thus, for example, WO 80/02365 discloses gelatin-coated gas microbubbles for enhanced ultrasound imaging 3216B. However, such microbubbles are not sufficiently stable for use in electrocardiography⁴ in dimensions (1-10 μιη), taking into account the particular thinness of the wrapping film. *

US-A-4774958 discloses the use of microbubble dispersions stabilized by coating with a denatured protein, such as human serum albumin. Such systems allow the production of microbubble systems having, for example, 2 to 5 µm in size, but do not yet provide effective visualization of the left heart and myocardial infarction. The use of such protein derivatives may also present difficulties due to potential allergic reactions.

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EP-A-0327490 discloses, inter alia, ultrasonic contrast agents consisting of a microparticulate synthetic biodegradable polymer containing a free or compound gas or a volatile liquid (i.e., having a boiling point below 60 ° C). Typical synthetic biodegradable polymers include hydroxy carbonic acid polyesters, polyalkyl cyanoacrylates, polyamino acids, polyamides, polyacrylated saccharides, and polyorthoesters.

Similar degradable microparticulate polymers based on polymerized aldehydes are described in EP-A0441468, while systems based on fine particle poly (amino acid) - poly (cyclic imide) derivatives are described in EP-A-0458079. "

EP-A-0458745 discloses air or gas filled ¹ microspheres in which the wrapping material is a deformable and elastic surface-deposited polymer, which is preferably biodegradable, by exemplifying the incorporation of polysaccharides, polyamino acids, polylactides, polyglycolides, lactide / lactone copolymers, polypeptides, proteins, polyorthoesters, polydioxa 3216 B -aminoketones, polyphosphazenes, polyanhydrides and poly (alkyl cyanoacrylates). Micro balloons are typically obtained by emulsion techniques that lead to the distribution of the polymer around the droplets of the volatile liquid which is subsequently evaporated.

WO 91/12823 discloses ultrasound contrast media consisting of gas or vapor filled polymer microcapsules; more suitable polymers include insoluble proteins such as denatured albumin. Microcapsules may be prepared by forming a protein sheath around a solid or liquid core (e.g., using simple or complex coacervation, double emulsion or minimizing solubility at the isoelectric point), reinforcing the sheath (by chemical treatment or heating) and removing the core (e.g., sublimation). or by evaporation). The use of dual emulsion techniques will result in microcapsules having a cellular structure with multiple gas or vapor filled chambers.

Gaseous contrast media are also known to be effective in magnetic resonance imaging (MRI) imaging, such as sensitivity contrast agents that reduce the intensity of the MR signal. Oxygen-containing contrast media are also potentially useful paramagnetic MRI contrast media.

In addition, in the field of X-ray imaging, it has been observed that gases such as carbon dioxide can be used as negative oral contrast agents.

It is generally accepted that polymer-based contrast media should be biodegradable to facilitate their final elimination or to be more readily absorbed by the subject. However, little attention has been given to specific polymer formation to maximize this objective confidence, usually based on the inherently slow biodegradability of polymers such as polyesters, polyanhydrides, polycarbonates, polyamides and polyurethanes, which are in principle derived from the ester, amide. or the sensitivity of urethane groups to enzymatic hydrolysis.

One exception is EP-A-0458745, which proposes to use as ultrasound contrast agents, among others, a specific class of esterified polypeptide derivatives which exhibit controlled biodegradability. These polymers, which are described in EP-A-0130935 as sustained release carriers for drugs, consist of compounds of the formula.

-NH-CH-CO)_X(CH₂) _y-COO-CR^aR^b-OCC-R^c (where R^a and R^b are alkyl or hydrogen atoms and R^c is a typically substituted aliphatic or aromatic group, or R^b is a hydrogen atom or an alkyl group and R^a and R^c together form a divalent group such as dimethylene, vinylene or phenylene, y is 1 or 2, and x is such that the polymer has a molecular weight of at least 5000), and copolymers thereof with other poly (amino acids). It is stated that the first step in the biodegradation of such polymers should be the cleavage of the side chain methylene diester groups to give polymers having the elements of the formula

- (NH-CH-CO) (CH₂) _y-COOH

It is contemplated that such polymers will continue to be cleaved by peptidase to their component amino acid (s), which may be absorbed by the host to which the polymer / drug combination was administered, typically slowly. In addition, peptide structures can cause allergic reactions.

Thus, there remains a need for contrast media polymeric substrates that combine good storage stability, post-administration stability, at least several cardiac injections into the circulatory system, and correspondingly rapid biodegradation.

The present invention is based on our inventions that these objectives can be achieved by obtaining contrast agents based on polymers, wherein these polymers have methylene diester groups represented by the formula (I): i-CO-OC (RV) -O-COf (I), ( in which R¹ and R² each is a hydrogen atom or a carbon-attached monovalent organic group or R and R together form a carbon-attached divalent organic group). Such elements are particularly rapidly degraded by simple esterase enzymes but are stable in the absence of enzymes. They may be attached not only to carbon-attached organic groups, as in the simple carboxylate esters, but also to -O- atoms, as in the carbonate esters.

Polymers of this type and various methods of their synthesis are described and are within the scope of the invention as disclosed in WO 92/04392, the disclosure of which is incorporated herein by reference. The elements of formula (I) in those polymers may, for example, be present in the polymer backbone, or as repeating elements, or as linking elements between parts of the polymer, or may be in crosslinking groups between polymer chains.

Another class of polymers of this type and their synthesis pathways are described and defined in the same application, and include non-crosslinking polymers, poorly soluble or insoluble in water, having a non-polypeptide polymer backbone bearing at least some of the above. the side chains having lipophilic moieties attached to the polymer backbone of formula (I) by methylene diester moieties, wherein said lipophilic moieties are biodegradable, to give a water-soluble polymer.

And yes, in one aspect of the present invention, contrast agents comprising <

gas-containing or gas-generating polymeric microparticles and / or microbubbles, characterized in that the polymer is a biodegradable polymer having the formula (II) elements f (0 ^ -00-0-0 ^^) - 0-00- (0) ^ ( II) in which R¹ and R² are defined above, om and n, which may be the same or different, each being zero or a unit.

Polymers having the elemental formula (II) wherein one or both of m and n are 1, i.e. having carbonate ester groups, have not been previously proposed except for WO 92/04392, cited above, and may be * particularly rapidly biodegradable in some cases.

Polymers having a polypeptide backbone can produce adverse allergic reactions, and non-polypeptide polymers are generally preferred.

The polymers usefully used in the present invention may contain elements of formula (III) f (O) _m-CO-OC (R⁴R²) -O ~ CO- (O) _n-R³f (III),

2 wherein R, R, m and n have the meanings defined above and R³ is a divalent organic group, ie a divalent organic group attached to carbon.

Such polymers may have a plurality of elements of formula (III) having various values ​​of m, n, R, R and R, e.g. as block copolymers or graft copolymers. The diester compounds may appear at any interval throughout the polymer, e.g., as a cross-linking group or between moieties of a copolymer, in which case R will be a polymeric group. Alternatively, the bonds may be substantially throughout the polymer, in which case R is preferred³ there will be a lower molecular weight group.

Particularly interesting elements of formula (III) are those wherein m is 0 and n is 0 or 1, i.e., dicarboxylate elements of formula (IV) f CO-OC (R¹R²) -O-CO-R³} (IV), or carboxylate-carbonate elements of formula (V):

f CO-OC (R^rR²) -O-CO-OR³f (V).

R and R may, for example, each be hydrogen or a carbon-attached hydrocarbyl group or a heterocyclic group, e.g. having 1-20 carbon atoms, e.g. an aliphatic group such as an alkyl or alkenyl group (preferably having up to 10 carbon atoms). ), a cycloalkyl group (preferably having up to 10 carbon atoms), an arylaliphatic group such as an arylalkyl group (preferably having up to 20 carbon atoms), an aryl group (preferably having up to 20 carbon atoms) or a heterocyclic group, containing up to 20 carbon atoms and one or more heteroatoms selected from O, S and N.

Such a hydrocarbyl or heterocyclic group may carry one or more functional groups, such as halogen atoms or groups of the formula -NR⁴R⁵,

CONR⁴R⁵, -OR⁶, -SR⁶ and -COOR⁷, where R⁴ and R⁵which may be the same or different are hydrogen atoms, acyl groups, or hydrocarbyl groups as defined

R is R; R is a hydrogen atom or an acyl group, 12 7 or a group defined by R or R, and R is a hydrogen 12 12 atom or a group defined by R and R. Where R and R are a bivalent group, it may be, for example, an alkylidene, alkenylidene, alkylene or alkenylene group (preferably having up to 10 carbon atoms) which may have one or more functional groups as defined above.

As defined above, the diester groups of formula (I) can be isolated over a wide range of groups. Where it is necessary for the polymer to cleave into relatively short portions to aid in biodegradation, group R³which distinguishes diester elements of formula (II) may be, for example, an alkylene or alkenylene group (e.g. containing up to 20, preferably up to carbon atoms), a cycloalkylene group (preferably containing up to 10 carbon atoms), an arylalkylene group (preferably containing up to 10 carbon atoms) up to 20 carbon atoms and may be attached via aryl and / or alkyl moieties - such groups include, for example, two aryl groups linked by an alkylene chain) or a heterocyclic group containing one or more heteroatoms selected from O, S and N (preferably up to carbon atoms). Group R³ may have functional groups such as R and R above and / or. 3.

substituents such as oxo groups; The carbon chains of the n, R groups may be inserted and / or terminated with heteroatoms such as O, N or S, e.g., together with oxo substituents to form compounds such as ester, thioester or amide groups. In order to increase the hydrophilicity of the polymers, R may consist of one or more sets of oxyethylene or polyoxyethylene moieties, and / or hydroxy-substituted carbon chain sets (e.g., as hydroxyalkyl groups or sugar groups). Such sets of elements may, for example, be attached via oxycarbonyl groups, e.g., short chain dicarboxylic acid groups such as oxalyl, malonyl, succinyl, glutaryl or adipoyl.

Where R is a polymeric group, it may be, for example, a polyamide, a poly (hydroxy acid), a polyester, a polycarbonate, a polysaccharide, a polyoxyethylene, a polyoxyethylene-polyoxypropylene block copolymer, a polyvinyl alcohol or an ether / alcohol group.

Wide range of possible groups R¹, R² and R³ The scope enables the hydrophobicity of the polymer and the hydrophilic nozzle to be adapted for any application required. And yes, polymers can usefully be formulated to be insoluble in water but to give water-soluble degradation products by enzymatic hydrolysis.

Existing aliphatic groups such as R¹ and R² may be linear or branched, saturated or unsaturated, and include, for example, alkyl and alkenyl groups, such as methyl, ethyl, propyl, isopropyl butyl decyl or aliphatic. Araliphatic groups include (monocarbocyclic aryl) -alkyl groups, such as benzyl groups. Aryl groups include mono- or bicyclic aryl groups such as phenyl, tolyl or naphthyl. Heterocyclic groups include 5- or 6-membered heterocyclic groups, preferably having one heteroatom, such as furyl, thienyl or pyridyl. Halogen substituents may be, for example, chlorine, bromine or iodine.

Biodegradation of polymers having the elements of formula (III) will generally be accomplished by enzymatic hydrolytic cleavage of the bonds linking the -OC (RR) -O- group to adjacent carbonyl groups, typically yielding an aldehyde or ketone of the formula R -CO-R. The intervening moieties will form different products depending on whether m or n is zero or 1. Where m or n is zero, the hydrolytic cleavage usually yields a carboxyl group; where m and n are 1, a hypothetical carbonic acid group -R is formed³-O-COOH, which usually removes carbon dioxide to form the -R-OH group. This may be useful where release of carbon dioxide is physiologically or functionally required.

As noted above, the elements of formula (III) may be different within the same polymer, i.e. the polymers may be copolymers such as block or graft copolymers. The polymers may be copolymers formed with biodegradable monomers; the biodegradable moieties remaining after enzymatic or other degradation should be of an acceptable size so as to ensure their solubility in water or dispersion in water, thereby allowing rapid dispersion or elimination; biodegradable parts such as groups R can be studied³ parts of formula (III) which substantially combine the biodegradable groups of formula (II).

The polymers may be linear, branched, or cross-linked. Branches and crosslinked polymers generally have functional groups or double bonds in their monomer groups R¹, R² or R³. The resulting cross-linked or branched polymers will thus have some elements of formula (III) wherein R, R and

/ or R are replaced by cross-linked or branched chains.

In general, where are carbon atoms joining R³ in addition to the groups of formula (II) being chiral, a more suitable chirality is that found in natural products, since cleavage enzymes will generally act more efficiently on such structures.

In general, it has been observed that in crosslinking biodegradable polymers the crosslinking segments are often degraded first, thereby exposing the rest of the network for enzymatic hydrolysis. Therefore, it is particularly useful to have groups of formula (II) in the polymer cross-linking chains. Thus, one possibility is to transform a water-soluble long-chain natural or synthetic non-biodegradable or slowly degradable substance, such as a polysaccharide or oligosaccharide, or a short-chain polyacrylamide, into a water-insoluble crosslinker using crosslinking groups of formula (II). . This can minimize the cost of the final product by reducing the amount of relatively expensive biodegradable elements of formula (II).

Block copolymers may, for example, have a structure

-E (O) h-CO-OC (R¹R²) -O-CO- (O) mR³? q^A (O)_n-CO-OC (R¹R²) -O-CO- (O) mR³r^B, where the proper values ​​of R, R, R, m and n are such that the repeating elements in blocks A and B are different and q and r are integers, such as 10-20. One or more subsequent blocks may be connected to those shown above.

Polymers containing elements of formula (III) which are useful according to the present invention may, for example, be obtained as described in the aforementioned WO 92/04392 application.

Another class of polymers useful in the present invention comprises the elements represented by formula (VI) f Al · (L) j - (O)_m-CO-OC (R^XR^Z) -O-CO- (O) _n-R^Yeah (VI) wherein A is a repeating non-polypeptide polymer backbone chain element; L is a linking group; 1 1 · 2 is zero or a unit; m, n, R and R are as defined herein above; and R^3a is a lipophilic organic group such as an organic group as defined above for R¹and R². Group A and Group L (where present) should be such that the polymeric cleavage products derived from the biodegradation of the methylene diester group typically have the elements described in formula (VII)

Έ Af

<td></td><td>(L)_l-</td><td>COOH</td><td></td><td></td><td>(VII),</td>

<td>(in which A, L</td><td>and 1 is</td><td>how</td><td>here</td><td>defined</td><td>earlier),</td>

<td colspan="2">when m in formula (VI) is</td><td>. zero</td><td>, and</td><td>elements,</td><td>descriptive</td>

<td>formula</td><td>4 Ali</td><td></td><td></td><td></td><td></td>

<td></td><td>(L)_x-</td><td>OH</td><td></td><td></td><td>(VIII),</td>

<td>(in which A, L</td><td>and 1 is</td><td>how</td><td>here</td><td>defined</td><td>earlier),</td>

when m in formula (VI) is 1, they are soluble in water.

Factors affecting the water solubility of these polymer degradation products include the nature of the repeating elements A and any comonomer elements that may be present, the length of any linking group L and the length of the entire chain of the polymer.

Preferably, the repeating moieties A and any comonomer moieties are relatively short, e.g., having up to 10, e.g. 1-6 carbon atoms, and can usually contain one or more hetero atoms selected from oxygen, nitrogen and sulfur. , and / or substituted by one or more substituents on such heteroatoms (e.g., oxo, hydroxyl and amino). Where the hydrophilic groups are incorporated in the repeating elements A and / or any comonomer elements, the size of these elements need not be limited, and thus the possible elements include polyoxyethylene (e.g. as methacrylic acid in polyoxyethylene esters).

Any linking groups L are preferably short and include, for example, C_x_₃ alkylene groups such as methylene, ethylene or propylene, typically attached to the polymer backbone via and / or embedded (where appropriate), e.g., oxy, carbonyl, oxycarbonyl, imine or iminocarbonyl. Where polar groups are present, such as oxygen atoms or imine groups, the linking groups may be longer without excess inhibition of water solubility. Suitable polymer degradation products thus include, for example, polyvinyl alcohol, polyacrylic acid, polymethacrylic acid, polyhydroxyalkyl acrylates and methacrylates such as poly (2-hydroxyethyl acrylate), polysaccharides such as starch and dextran, polyesters, such as polyoxyethylenes and polyoxypropylenes, polyacrylamides and polymethacrylamides such as poly (N-hydroxyalkyl) acrylamides and methacrylamides (e.g. polyN- (2-hydroxypropyl) methacrylamide), polyamides, polyurethanes and epoxy polymers.

In general, the polymer degradation products of the biodegradable polymers having the elements of formula (VI) may not be biodegradable themselves due to their water solubility; in this way they may, for example, be polyvinylic or polyacrylic. Therefore, the invention includes the use of polymers having elements of formula (VI) wherein A is a repeating polyolefinic element, such as ethylene or propylene. It will be appreciated that polymers of this type can be prepared by free radical polymerization techniques relatively easily and economically, unlike, for example, the more sophisticated methods of polypeptide synthesis required to prepare the polymers described in EP-A-0130935.

R¹, R² and R^3a The nature and size of the elements of formula (VI) will influence both the degree to which such elements are rendered lipophilic and thus water insoluble, and the degree to which the side chain is biodegradable. In this way, large and / or bulky groups will tend to reduce biodegradability through spatial barriers, thereby increasing the lipophilicity of the polymer. In one useful class of side chains, each of Rs¹ and R² is selected from hydrogen and alkyl groups such as methyl, and R^3a is a lower alkyl group, e.g. having at least 3 carbon atoms, as in propyl and butyl groups; such side chains combine essential degrees of lipophilicity and biodegradability.

It is understood that, for example, linear polymers having elements of formula (VI) may exhibit enhanced workability parameters (e.g., solubility in organic solvents and melting) compared to crosslinking polymers, e.g., having crosslinking groups activating (II). ) elements of the formula. In that sense, they can also be contrasted with the polymers described

EP-A-0130935, which have the potential disadvantage that, due to the high level of hydrogen bond formation shown in the polypeptides, they will tend to have relatively high melting points such that they cannot be fused without unwanted degradation.

Polymers of formula (VI) may be prepared by any convenient route, for example, or (A) by reacting a pre-formed water-soluble polymer with a reagent serving to introduce a methylene diester side chain of the required lipophilic group, or (B): polymerization of a functional monomer having the required lipophilic methylene diester side chain.

The process (A) may be carried out, for example, by reacting a polymer having additional alcoholic hydroxyl groups (e.g., polyvinyl alcohol, polyhydroxyalkyl acrylate or methacrylate, or polysaccharide) with a compound of formula (IX)

X-CO-OC (R^XR²) -O-CO- (0) _n-R^3a (IX) r wherein R¹, R², R^3a and n is as previously defined and X is a leaving group such as a halogen atom such as fluorine, chlorine, bromine or iodine). Reagents of formula (IX) may, for example, be obtained as described in Folkman and Lund, Synthesis, 1990, 1159. Such reactions which will yield polymers having the elements of formula (VI) wherein m is 1 are conveniently carried out in solution. , e.g., in a solvent such as tetrahydrofuran, with the addition of a weak nucleophilic base such as ipiridine. A catalytic amount of a tertiary amine such as 4-dimethylaminopyridine can be used ^; also. The number of hydroxyl groups of the polymer that are exposed to form the required lipophilic methylene diester groups can be controlled by appropriate selection of factors such as reagent volumes, reaction time and temperatures to maintain the final hydrophilic-lipophilic balance of the lipophilized polymer. The product may be purified by standard techniques such as solvent extraction and / or dissolution / re-precipitation and / or flash chromatography.

Alternatively, process (A) may be carried out by reacting a polymer having additional carboxyl groups (e.g., polyacrylic acid, polymethacrylic acid, or water-soluble peptide) with the polymer of formula (X):

Χ-Ο ^^ - Ο-ΟΟ- (O) _n-R^3a (X), (wherein R, RR, X and n are as hereinbefore defined). Such reactions, which will give polymers of the formula (VI) wherein m is zero, are conveniently carried out in a solution such as a solvent such as N, N-dimethylformamide in the presence of a strong base such as an alkali metal alkoxide. as potassium t-butoxide. A catalytic amount of crown ether such as 18-crown-6 may be used in the same manner. Again, the hydrophilic-lipophilic balance of the polymer product can be controlled by appropriate selection of reaction parameters to determine the number of carboxyl groups that are exposed and can be purified by conventional techniques.

Reagents of formula (X) may be prepared, for example, by reaction of an aldehyde or ketone of formula R -CO-R with an acid halide or a halogen formate ester of formula R^3a- (O)_n-CO-X, e.g. in the presence of a catalyst such as zinc chloride or pyridine.

(A) The process may also be carried out, for example, by reacting a polymer containing functional groups with a reagent having the required lipophilic methylene diester group and having a terminal group reacting with such functional groups; end groups reacting with epoxy groups include amino hydroxyl and carboxyl groups. Similarly, the latter groups may be present in the starting polymer and the reagent may have a terminal epoxy group.

Where the products are for intravenous use, it is generally preferable that the polymer starting materials used in process (A) have a molecular weight of less than 40,000. Where products are used for other purposes, molecular weight is not the key.

(B) The process may be carried out using any monomer which may be polymerized or copolymerized to form non-crosslinking polymers and which has one or more substituents which do not participate in the polymerization and which may be derived prior to the polymerization to introduce the required lipophilic methylene diester group. Free radical, condensation and ionic polymerization techniques can be employed.

The free radical polymerization may, for example, be carried out using carboxyl-containing monomers such as acrylic acid or methacrylic acid obtained by reaction with a compound of formula (X), or hydroxyl-containing monomers such as 2-hydroxyethyl acrylate or N- ( 2-hydroxypropyl) methacrylamide obtained by reaction of a compound of formula (IX). Alternatively, the hydroxyl-containing monomers may be treated with a compound of formula (XI):

X-CO-OC (rV) -X (XI), (wherein R¹, R² and X are as hereinbefore defined) and the resulting product is treated with the appropriate carboxylic acid salt R^3a-COOH.

The free radical polymerization may also be carried out using the vinyl carbonate esters of formula (XII):

CH₂= CH-O-CO-OC (R ^²) -O-CO- (O) _n-R^3a (XII), {in which n, R¹, R² and R^3a are as defined above). Such monomers, e.g. having n = 0, can be obtained by reaction of vinyl chloroformate with aldehyde or ketone R¹R²C =^:0, in the presence of a catalytic amount, such as pyridine or Lewis acid, to give the generally substituted chloromethyl vinyl carbonate of formula (XIII):

CH₂= CH-O-CO-OC (R¹R²) -C1 (XIII) in which R¹ and R² are as defined above) followed by reaction with, for example, a suitable carboxylic acid R^3a-COOH salt, preferably in the presence of catalytic amount of suitable crown ether. It is understood that these compounds (XII) may be formally regarded as vinyl alcohol derived from a compound of formula (IX). The resulting polymers should accordingly be enzymatically biodegraded into polyvinyl alcohol.

Conventional polymerization techniques for general, solution, emulsion and suspension can be used. The molecular weight of the intravenously polymeric product used, which should preferably not exceed 40,000, can be controlled by the use of chain growth factors such as mercaptans from which the growing polymer chain can secrete a proton leading to chain termination and sulfur radical opening, whereby the molecular weight of the polymer will be controlled by the type and concentration of chain growth factor.

Suitable vinyl monomers, e.g., having a carbonyl group adjacent to the vinyl group, such as acrylic or methacrylic esters, e.g., synthesized as described above, may also be subjected to ionic polymerization, both anionic and cationic; such techniques are particularly suitable for the production of a well-defined molecular weight polymer, particularly for relatively low molecular weight materials.

The condensation polymerization can be carried out using a number of suitably functionalized monomers, examples of which can be described by formulas (XIV) and (XV):

Y (CH₂)_a

CH- (O) _m-CO-OC (R^LR²) -O-CO- (O) _n-R^3a (XIV) (CH₂)_b

Y (CH₂)_a

CH- (O) _m-CO-OC (R^LR²) -O-CO- (O) _n-R^3a (XV), (CH₂)_b

I

CH- (O)_m-CO-OC (R^rR²) -O-CO- (O)_n-R^3a (CH₂)_c

Y (where R¹, R², R^3a, m and n are as defined above, Y is a reactive group such as a carboxyl, hydroxyl or epoxy group such as 2,3-epoxypropyloxy, oa, b and c each may be zero or a small integer such as 1,2 or 3. In formula (XV), the groups R, R and R and m and n may be the same or different in the two side chains. Such monomers can be used in conventional condensation reactions with reagents such as dicarboxylic acids, dialkols, diamines, di (acid chlorides), diisocyanates and bisepoxy compounds to give polymers such as polyesters, polyamides, polyurethanes and epoxy polymers. The molecular weight of the polymeric product may be controlled by appropriate selection of appropriate reaction times, temperatures, etc., and / or by the use of monofunctional chain terminators.

Where appropriate, the polymers may be prepared by emulsion polymerization techniques; this can be particularly valuable, for example, when it comes to obtaining polymers in the form of monodisperse particles. Emulsion polymerization methods for producing particles, particularly monodisperse particles, are described in EP-A-0003905, EP-A-0091453, EP-A-0010986 and EP-A-0106873.

The polymers used in the contrast media of the present invention can conveniently be of relatively low molecular weight, e.g., less than 40,000, since this can assist in both biodegradation and dispersion of degradation products. Therefore, the term polymer as used herein should be understood to include low molecular weight materials such as oligomers.

It is understood that polymers for medical use must form non-toxic, physiologically acceptable degradation products; therefore the group R¹, R², R³ and R^3a Elements of formulas (III) and (IV) should be selected according to this requirement and the need for degradation products to be readily dispersed in the body. Carbon dioxide released by decomposition of carbonate ester groups will generally be physiologically acceptable.

Contrasting agents of the present invention can be used in a variety of diagnostic imaging techniques including ultrasound, MRI and X-ray imaging. Their use in diagnostic ultrasound imaging and MRI imaging, for example as sensitivity contrast agents, are preferred features of the present invention.

The contrast media of the present invention may use any biocompatible gas, such as air, nitrogen, oxygen, hydrogen, nitric oxide, carbon dioxide, helium, argon, sulfur hexafluoride and low molecular weight, typically fluorinated hydrocarbons such as methane, acetylene or carbon tetrafluoride. The gas may be free inside the microbubbles, or it may be activated or loaded into the available material. The term gas as used herein includes all gaseous materials at 37 ° C.

Gas precursors include carbonates and bicarbonates such as sodium or ammonium bicarbonate and amino malonate esters.

For ultrasound applications such as echocardiography, microbubbles of 0.1-10 µm, e.g. However, substantially larger bubbles, such as those above 50 µm in size, may be useful in other studies, such as gastrointestinal imaging or uterine or fallopian tube studies.

If necessary, λ individual stabilizers, such as amphiphiles and inorganic materials such as silica or iron oxide, which are only partially moistened with a solvent system, such as having a particle size of 1 to 500 nm, may be incorporated into microbubbles. Colloidal silicon having a particle size of 5 to 50 nm can be usefully employed for this purpose.

Contrasting agents of the present invention can be obtained by a variety of methods, usually emulsion methods known in the art of polymers. Thus, for example, methods of forming microcapsules for preparing microcapsules having a polymeric material wall or membrane are described in the literature as PD Deasy,

Microencapsulation and Related Drug Processes, Marcei Dekker Ine., New-York (1984).

One useful method corresponds to the interfacial precipitation method described in EP-A-0458745 above, which consists of dissolving or suspending the polymeric wall-forming material in a water-immiscible low-boiling organic solvent (e.g., an aliphatic or cycloaliphatic hydrocarbon, 10 carbon atoms, or in a suitable ether, ester or other lipophilic solvent, emulsifying the resulting solution or suspension (e.g. by high speed mixing) in the aqueous phase (preferably containing a surfactant to stabilize the resulting oil in water emulsion) and finally separating the organic phase (e.g. by evaporation or lyophilization, preferably the gas to be activated) , in the atmosphere) with which the polymer forms a membrane separating the aqueous and organic phases.

The size of the microparticles / microbubbles thus formed can be controlled by adjusting the mixing rate during emulsification, giving smaller particles for rapid mixing, and is exposed to a surfactant which may, for example, be selected from fatty acids (e.g., linear chain saturated or unsaturated acids). containing 10-20 carbon atoms) carbohydrate and their triglyceride esters, phospholipids (eg lecithin), proteins (eg human serum albumin), polyoxyethylenes and block copolymers containing hydrophilic and hydrophobic blocks (e.g., polyoxyethylene-polyoxypropylene block copolymers such as Pluronics). Typically, such emulsifiers are used in an amount of from 1 to 10% w / v. in percentages relative to the water phase. Common additives can be incorporated into the polymer; Thus, for example, materials such as polyethylene glycols may be introduced to alter the flexibility and / or polarity of the membrane. Alternatively, the polymer particles may be coated with, for example, elements, proteins or alter their aggregation tendencies and / or biological properties with polyethylene glycol polysaccharides.

The porosity of the membrane and its permeability to solvents, solutions, and gases can also be controlled by being dependent on the difference between the boiling point of the volatile organic phase and the surrounding aqueous phase; and yes, the porosity of the membrane increases with the difference between boiling points.

Alternatively, the polymer may be dissolved in a suitable organic solvent (e.g., methylene dichloride, dimethylsulfoxide, tetrahydrofuran, or dimethylformamide) and then dispersed (e.g., using a high speed blender) in an aqueous phase (preferably containing a polymeric material such as polyvinyl alcohol or poloxamer). so as to precipitate a fine particulate polymeric material that can be collected and lyophilized, to provide a porous microparticle polymer according to the present invention. Such methods are described in the above-mentioned EP-A-0458079. Variants of the microparticle preparation include the introduction of an organic polymer solution, preferably in combination with a physiologically acceptable stabilizer such as hydroxypropyl cellulose, into liquid nitrogen. Alternatively, the polymer may be dissolved in a suitable organic solvent (e.g., methylene chloride or tetrahydrofuran), followed by spray-drying the solution or the aqueous solution of the organic polymer in an oil-in-water or water-in-oil emulsion.

The microparticles of the present invention may also be prepared using a coacervation or double emulsion technique, such as that described in WO 91/12823 above. Thus, for example, an aqueous phase containing a water-soluble polymer (hereinafter referred to as a prepolymer) may be emulsified with a volatile organic solvent (e.g., an aliphatic or cycloaliphatic hydrocarbon, or a perfluorinated hydrocarbon having up to 10 carbon atoms) to form oil-in-water emulsion, dehydrogenation factor, salt such as inducing prepolymer

Coacervation agent (eg. Such as isopropanol or sodium sulphate), the addition concentration of the oil droplets, followed by addition of the desired surfactant inhibit microparticle aggregation which is formed by coupling cross-prepolymer Biodegradable formula (II) cell input, the generation van deck insoluble porous polymer microparticles that can be dried by lyophilization. Corresponding crosslinking techniques and reagents for crosslinking water soluble prepolymers such as polyacrylamides are described in detail in our aforementioned WO 92/04392.

The contrast agents of the present invention may be stored and transported in dry form, under such conditions, they are normally infinitely stable, and mixed with a suitable liquid carrier (e.g., sterile saline or phosphate infused or otherwise) prior to use. . They should thus be stored in suspension, particularly in the case of microspheres, where the porosity of the polymeric membrane is relatively low, being essentially completely stable in aqueous media in the absence of esterase enzymes.

water for injections, buffer). In this way, can also bearers, wrapping

The following non-limiting examples illustrate the invention.

General things

Methacrylic acid was distilled under high vacuum to remove the stabilizer.

The 2,2'-Azobisisobutyronitrile (AIBN) thermal initiator was purified by crystallization from methanol.

All reactions were performed under N₂ in the atmosphere.

Molecular Sieve Chromatography (SEC):

Pump: Knauer HPLC Pump 64;

Detector: Knauer Differential Refractometer;

Columns: Polymer Laboratories PL Gel Column Series Pore Size 10⁴ A, 500 A, 100 A, particle size 5 µm, length 30, 30 and 60 cm, respectively;

Solvent: THF;

Calibration: Polystyrene standards (Polymer Laboratories);

Flow Marker: Toluene;

Software: Polymer Laboratory GPC / SEC Software, Version 5.10;

Mw: average molecular weight;

Mn: molecular weight average molecular weight;

Mw / Mn: polydispersity;

Mp: molecular weight at maximum detector height.

List of abbreviations

Tg: Glass transition temperature;

TBA-OH: tetrabutylammonium hydroxide;

TBA: tetrabutylammonium;

AIBN: 2,2'-azobisisobutyronitrile;

SO₂C1₂: sulfuryl chloride;

EtSCl: Ethanesulfenyl chloride;

DBU: 1,8-diazabicyclo [5.4.0] undec-7-ene (1,5-5);

HSA: Human serum albumin.

EXAMPLE - Synthesis of Intermediates

a) Methylene dimethacrylate for four evaporated

Potassium hydroxide solution (1.00 M, 40.00 mL) was added to matacrylic acid (3.44 g, 40.00 mmol) at 0 ° C, and the solution was freeze-dried for 16 hours. Dry dimethylformamide (230 mL) was then added and the suspension was warmed to 60 ° C under a dry nitrogen atmosphere. Diiodomethane (1.61 mL, 20.00 mmol) was added twice in 10 minutes and the reaction mixture was left at 60 ° C for days. Solvent under reduced pressure (0.05 mmHg) before adding diethyl ether (140 mL), saturated aqueous sodium bicarbonate (50 mL) and water (50 mL). The aqueous layer was extracted with diethyl ether (6 x 60 mL) and the ether extracts washed with water (4 x 50 mL), dried (MgSO₄) and evaporated to give 2.63 g (72%) of the title compound.

⁴Η NMR (60 MHz, CDCl1)₃): δ 1.97 (2xCH₃, m), 5.63 (2xH-C =, m), 5.88 (CH₂, s), 6.18 (2xH-C =, m).

IR (ribbon, cm¹): 2987 (s), 2962 (s), 2930 (s), 1732 (s), 1638 (s), 1454 (s), 1315 (s), 1295 (s), 1158 (s), 1100 (s) ), 1012 (v), 989 (v).

(b) Methylene bis (16-hydroxyhexadecanoate) (i) 16-Triphenylmethoxyhexadecanoic acid

A solution of 16-hydroxyhexadecanoic acid (1.36 g, 5.00 mmol), triphenylmethyl chloride (1.53 g, 5.50 mmol), triethylamine (1.25 mL) and 4-dimethylaminopyridine (10.03 g, 0.25 mmol) was stirred overnight in dry dimethylformamide at room temperature under nitrogen. After stirring for 16 hours, the brown cloudy solution was poured into ice water and extracted with dichloromethane (5x50 mL). The organic phases were washed with saturated ammonium chloride solution (2 x 100 mL), water (2 x 100 mL), and dried over MgSO 4.₄. The solvent was removed under reduced pressure and the product was purified by flash column chromatography on silica gel with dichloromethane / methanol as eluent to give the title compound as a yellow oil (0.41 g).

¹³C NMR (75 MHz, CDCl 3)₃): δ 24.9, 25.7, 26.3, 29.2, 29.5, 29.6, 29.7, 30 32.8, 34.1, 62.9, 63.7, 86.2, 144.5,

177.2.

MS (Cl): 515 (M + H) @ +.

(ii) cesium salt of 16-triphenylmethoxyhexadecanoic acid

Aqueous cesium carbonate (1M, 0.16 mL) was added dropwise to the

A solution of 16-triphenylmethoxyhexadecanoic acid (0.16 g, 0.31 mmol) from Example 1b (i) in tetrahydrofuran (10 mL) was added until the pH reached about 8, then the solvent was removed under reduced pressure and vacuum for 2 hours. The oily residue was dispersed in dry dimethylformamide (10 mL) and evaporated to dryness in vacuo.

the residue is dried semi-crystalline iii) Methylene bis (16-triphenylmethoxyhexanoate)

Diiodomethane (0.04 g, 0.16 mmol) was added to cesium salt of 16-triphenylmethoxyhexadecanoic acid (0.31 mmol) from 1b (ii) dimethylformamide (10).

60 ° C sample suspension in dry mL). The reaction mixture was heated under nitrogen for two days.

The solvent was removed in vacuo and the product purified by flash chromatography on a 2x5 cm silica column with chloroform as eluent to give the title compound as a brown oil (0.10 g).

¹³C NMR (75 MHz, CDCl 3)₃) : 0 24.6, 26.3, 29.0, 29.2, 29.4, 29.5, 29.6, 29.7, 30.0, 34.0, 63.7, 79.0, 86.2, 126.7, 127.2, 127.6, 127.9, 128.7, 144.5, 172.5.

(iv) Methylene bis (16-hydroxyhexadecanoate)

Methylene bis (16-triphenylmethoxyhexadecanoate) (0.07 g, 0.07 mmol) from Example 1b (iii) was dissolved in glacial acetic acid (8 mL) and heated at 55 ° C. The reaction is controlled by thin layer chromatography. After 10 hours, the reaction mixture was poured onto ice, the product was filtered off, washed with aqueous sodium bicarbonate and water and dried under reduced pressure. The product was purified by flash column chromatography on silica gel with chloroform / methanol (20: 1) as eluent to give the title compound as a white solid.

^X1 H NMR (300 MHz, CDCl 3)₃): δ 1.2-1.4 (m, 44H), 1.5-1.6 (m, 8H) 2.35 (t, 4H), 3.64 (t, 4H), 5.75 (s, 2H).

(c) Methylene bis (12-hydroxydodecanoate)

DBU (2.0 mmol) was added to a solution of 12-hydroxydodecanoic acid (2.0 mmol) in DMF (2 mL). The solution was stirred for 5 minutes before adding CH₂I₂ (1.0 mmol), followed by stirring at 60 ° C for a further 12 hours. DMF was then separated under reduced pressure, and the remaining material was dissolved in CHCl3₃(50 mL), washed with 10% K₂CO₃; 3x20 mL), dried (MgSO 4)₄) and evaporated. The resulting product was purified by flash chromatography on silica gel using CHCl₃/ MeOH 95: 5 for the elution; yield 75%.

^X1 H NMR (CDCl₃): δ 1.20-1.40 (m, 28H), 1.50-1.68 (m,

10H), 2.35 (t, J 7.5 Hz, 4H), 3.63 (t, J 6.6 Hz, 4H), 5.74 (s, 2H).

¹³C NMR (CDCl₃): δ 24.62, 25.75, 28.98, 29.19, 29.40,

29.42, 29.48, 29.56, 32.80, 33.99, 63.01, 79.06,

172.53.

MS (EI): 445 (M + 1, 100).

d) Methylene bis (10-hydroxydecanoate)

DBU (4.24 g, 0.027 mol) was added to a solution of 10-hydroxydecanoic acid (5.0 g, 0.027 mol) in DMF (100 mL). After stirring for 5 minutes, diiodomethane (4.09 g, 0.014 mol) was added and the mixture was stirred at room temperature for a further 3 days. DMF was evaporated under reduced pressure and the residue was dissolved in chloroform (100 mL) and water (50 mL). After separating the phases, the aqueous layer was extracted with chloroform (3x75 mL) and the combined organic phase dried (MgSO 4).₄). The solvent was removed under reduced pressure, and flash chromatography gave 2.98 g (54.9%) of the title product.

^ΧΗ NMR (60 MHz, CDCl1)₃): δ 1.30-1.80 (m, 28H, CH)₂), 2.35 (m, 4H, CH)₂CO), 3.65 (m, 6H, 2 X CH)₂O + 2 X OH), 5.75 (s, 2H, -OCH, O-).

(e) Bis (chlorocarbonyloxymethyl) terephthalate (i) Bis (ethylthiocarbonyloxymethyl) terephthalate

Potassium tert. butoxide was added to a solution of terephthalic acid (2.40 g, 0.014 mol) in DMF (100 mL). O-Chloromethyl S-ethylcarbothiatonate (Folkman M., Lund FJ, Synthesis, 1990, p. 1159) [1] (4.50 g, 0.028 mol) was added to the resulting suspension. Then 18 crown-6 (0.23 g, 0.87 mmol) was added and the reaction mixture was stirred at room temperature for 4 days. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was purified by flash chromatography (silica / chloroform) to give 3.38 g (62%) of the title compound.

^X1 H NMR (60 MHz, CDCl 3)₃): δ 1.3 (t, 6H, CH)₃CH₂), 2.95 (s, 4H, CH₃CH₂), 5.80 (s, 4H, OCH)₂O), 8.20 (s, 4H, Ph).

(ii) Bis (chlorocarbonyloxymethyl) terephthalate

SO₂C1₂ (0.73 g, 0.0054 mol) was added to bis (ethylthiocarbonyloxymethyl) terephthalate (1.02 g, 0.0054 mol) from Example le (i) at 0-5 ° C with stirring for 15 min followed by stirring at room temperature for 45 min. Evaporation of EtSCl at room temperature and the product 0.1 mmHg gave yellowish crystals.

Yield: 0.80 g (90%) ^X1 H NMR (60 MHz, CDCl 3)₃): δ 5.76 (s, 4H, OCH)₂O), 8.20 (s,

4H, Ph).

(f) Methylene bis (4-hydroxymethylbenzoate)

DBU (9.90 g, 0.065 mol) was added to 4-hydroxymethylbenzoic acid (9.89 g, 0.065 mL) in DMF (325 mL). After stirring for 5 minutes, diiodomethane (8.705 g, 0.035 mol) was added and the mixture was stirred at room temperature for 3 days. DMF was evaporated under reduced pressure and the residue was dissolved in chloroform (100 mL) and water (50 mL). After separating the phases, the aqueous layer was extracted with chloroform (3x75 mL) and the combined organic phase dried (MgSO 4).₄). The solvent was removed under reduced pressure to give 3.0 g (27%) of the title compound.

^l1 H NMR (60 MHz, CDCl 3)₃): δ 4.7 (s, 4H, HO-CH)₂-Ph), 6.2 (s, 2H, O-CH)₂-O), 7.4-8.2 (m, 8H, ph).

(g) (k) General procedure for chloromethyl carbonates

To a solution of chloromethyl chloroformate and selected alcohol in methylene chloride (200 mL) was added pyridine at 0 ° C. After 20 minutes The reaction mixture was washed with aqueous hydrochloric acid (1M, 10 mL), aqueous saturated sodium bicarbonate (10 mL), and water at 0 ° C and 21 h at 25 ° C. After drying (MgSO₄), separates the solvent under reduced pressure to give crude chloromethyl carbonate.

Table

<td>Pavyz-</td><td>Chloromethyl</td><td>Alcohol, ROH R,</td><td>Pyridine</td>

<td>dys 1</td><td>chloroformate</td><td>(g, mmol)</td><td>(g, mmol)</td>

<td></td><td>(g, mmol)</td><td></td><td></td>

<td>g</td><td> 25.01, 194</td><td>CH₃, (5.64, 176)</td><td> 15.52, 194</td>

<td>h</td><td> 15.81, 124</td><td>CH₃CH₂, (5.20, 113)</td><td> 9.91, 124</td>

<td>i</td><td> 14.20, 111</td><td>CH₃(CH₂)₃, (8.10, 109)</td><td> 8.90, 113</td>

<td>j</td><td> 20.01, 155</td><td>CH₃(CH₂)₉, (22.25, 139)</td><td> 12.54, 157</td>

<td>k</td><td> 20.02, 155</td><td>PhCH₂, (15.23, 141)</td><td> 12.54, 157</td>

(g) Methyl chloromethyl carbonate

The compound was obtained from chloromethyl chloroformate and methanol.

^X1 H NMR (60 MHz, CDCl 3)₃): δ 3.98 (s, 3H, OCH)₃), 5.85 (s,

2H, CH₂C1)

(h) Ethyl chloromethyl carbonate

The compound was obtained from chloromethyl chloroformate and methanol.

^X1 H NMR (60 MHz, CDCl 3)₃): δ 1.25 (t, 3H, CH₃), 4.25 (q,

2H, CH₂), 5.70 (s, 2H, OCH)₂C1).

(i) Butyl chloromethyl carbonate

The compound was obtained from chloromethyl chloroformate and butanol.

⁷1 H NMR (60 MHz, CDCl 3)₃): δ 0.86 (m, 3H)₃CH₂), 1.40 (m, 4H,

CH₂CH₂), 4.15 (t, 2H, CH₂-O), 5.63 (s, 2H, OCH)₂C1).

(j) Decyl chloromethyl carbonate

The compound was obtained from chloromethyl chloroformate and decyl alcohol. ·^X1 H NMR (60 MHz, CDCl 3)₃): δ 0.90-1.50 (m, 19H, CH)₃ and CH₂), 4.20 (m, 2H, CH)₂O), 5.75 (s, 2H, OCH)₂C1).

(k) Benzyl chloromethyl carbonate

The compound was obtained from chloromethyl chloroformate and benzyl alcohol.

^X1 H NMR (60 MHz, CDCl 3)₃): δ 5.20 (s, 2H, PhCH₂O), 5.70 (s, 2H, ClCH)₂O), 7.32 (s, 5H, Ph).

l) -p) General procedure for methacryloxyoxymethyl carbonates

Potassium tert. butoxide was added to a solution of methacrylic acid in DMF (200 mL). Chloromethyl carbonate from 1 gk samples is added to the resulting suspension. Then 18-crown-6 is added and the reaction mixture is stirred at room temperature for 24 hours. The reaction mixture is filtered and the solvent is removed under reduced pressure. The residue was dissolved in chloroform (30 mL) and washed with saturated aqueous sodium bicarbonate (10 mL) and water (20 mL). The organic phase is dried (MgSO 4)₄) and the solvent was separated under reduced pressure.

Table

<td>Pavyz- dys</td><td>Compound of 1 e.g. (g, mmol)</td><td>Potassium methacrylate (g, mmol)</td><td>18-crown-6 (g, mmol)</td><td>DMF (ml)</td>

<td> 1</td><td>g, (9.67, 78)</td><td> 8.71, 78</td><td> 1.01, 38</td><td> 350</td>

<td>m</td><td>h, (8.04, 60)</td><td> 6.73, 60</td><td> 0.6, 23</td><td> 300</td>

<td>n</td><td>i, (30.61, 122)</td><td> 13.67, 122</td><td> 2.5, 94</td><td> 600</td>

<td>o</td><td>j, (30.61, 122</td><td> 13.67, 122</td><td> 2.5, 94</td><td> 600</td>

<td>P</td><td>k, (22.01, 110</td><td> 13.64, 110</td><td> 1.5, 57</td><td> 550</td>

l) Methyl methacryloyloxymethyl carbonate

The compound was obtained from methyl chloromethyl carbonate and potassium methacrylate.

IR (KBr): 1772 (C = 0, m.p.), 1737 (C = 0, m.p.), 1635 (C = C, m.p.) cm ⁴Η NMR (300 MHz, CDCl1)₃): δ 1.91 (s, 3H, CH)₃C =), 3.79 (s, 3H, CH)₃O), 5.64 (m, 1H, CH)₂=), 5.80 (s, 2H, -OCH)₂O-),

6.16 (m, 1H, CH)₂=) .

¹³C NMR (75 MHz, CDCl 3)₃): δ 17.95 (CH₃C =), 55.13 (CH₃O),

82.18 (-OCH₂O-), 127.52 (CH₂=), 135.02 (C =), 135.02 (C =), 154.44 (C = 0), 165.46 (C = 0).

m) Ethyl methacryloyl oxymethyl carbonate

The compound was obtained from ethyl chloromethyl carbonate and potassium methacrylate.

IR (KBr): 1772 (C = 0, mp), 1736 (C = 0, mp), 1635 (C = C, mp) cm ¹^X1 H NMR (300 MHz, CDCl 3)₃): δ 1.27 (t, 3H, CH₃), 1.92 (s, 3H, CH)₃C =), 4.23 (q, 2H, CH)₂), 5.66 (m, 1H, CH)₂=), 5.80 (s, 2H, -OCH)₂O-), 6.20 (m, 1H, CH)₂=) .

¹³C NMR (75 MHz, CDCl 3)₃): δ 15.70 (CH₃CH₂), 19.60 (CH₃C =), 65.72 (CH₂O), 83.05 (-OCH₂O-), 127.76 (CH₂=), 135.40 (C =), 153.82 (C = 0), 165.42 (C = 0).

(n) Butyl methacryloyl oxymethyl carbonate

<td colspan="2">The compound and potassium</td><td>was received methacrylate.</td><td>of butyl chloromethyl carbonate</td>

<td>IR</td><td>(KBr)</td><td>: 1772 (C = 0,</td><td>st.), 1736 (C = 0, st.), 1635 (C = C,</td>

<td>st.</td><td>,) cm ¹</td><td></td><td></td>

⁷Η NMR (300 MHz, CDCl1)₃): δ 0.99 (t, 3H, CH)₃CH₂), 1.47 (m, 2H, CH)₂CH₂), 1.72 (m, 2H, CH)₂CH₂), 2.01 (s, 3H, CH)₃C =),

4.25 (t, 2H, CH₂-O), 5.74 (m, 1H, CH)₂=), 5.89 (s, 2H, OCH₂O), 6.27 (m, 1H, CH)₂=) .

¹³C NMR (75 MHz, CDCl 3)₃): δ 13.47 (CH₃CH₂), 17.97 (CH₃CH₂), 18.71 (CH₂C =), 30.36 (CH₂), 68.46 (CH₂O), 82.07 (-OCH₂O), 127.46 (CH₂=), 135.05 (C =), 153.89 (C = 0), 165.50 (C = 0).

o) Decyl methacryloyl oxymethyl carbonate

The compound was obtained from decyl chloromethyl carbonate and potassium methacrylate.

IR (KBr): 1772 (C = 0, mp), 1736 (C = 0, mp), 1635 (C = C, mp) cm¹^l1 H NMR (300 MHz, CDCl 3)₃): δ 0.90 (t, 3H, CH)₃), 1.28 (m,

14H, CH₂), 1.72 (m, 2H, CH)₂=), 1.99 (s, 3H, CH₃C =), 4.21

<td colspan="5">(t, 2H, CH₂O), 5.70 (m, 1H, CH)₂=), 5.86 (s, 3H,</td><td rowspan="2">-och₂o-</td>

<td> ), 6.24</td><td>(m,</td><td colspan="3">1H, CH₂=).</td>

<td>¹³C NMR</td><td> (75</td><td>MHz, CDCl₃) :</td><td>: δ 13.78</td><td>(CH₃), 17.76</td><td>(CH₃c =),</td>

<td> 22.76-31</td><td> .55</td><td>(CH₂), 68.60</td><td>(CH₂O), 81</td><td>.90 (-OCH₂O-)</td><td> , 127.28</td>

(CH₂=), 134.86 (C = 0), 153.73 (C = 0), 165.33 (C = 0).

p) Benzyl methacryloyl oxymethyl carbonate

The compound was obtained from benzyl chloromethyl carbonate and potassium methacrylate.

IR (KBr): 3077 (Ph), 1772 (C = 0, st), 1736 (C = 0, st),

1635 (C = C, hr) cm '

<td>⁴1 H NMR (300 MHz,</td><td>CDC1₃) :</td><td colspan="2">δ 1.96 (s, 3H, CH₃C =), 5.22 (s,</td>

<td>2H, CH₂O), 5.70</td><td>(m, 1H,</td><td>CH₂=), 5.87 (s,</td><td>3H, -OCH₂O-),</td>

<td>6.22 (m, 1H, CH)₂=</td><td> 3, 7.39</td><td>(s, 5H, Ph).</td><td></td>

<td>¹³C NMR (75 MHz,</td><td>CDCl3):</td><td>δ 17.96 (CH₃C =),</td><td>69.91 (CH₂O),</td>

<td>82.03 (-OCH₂O-),</td><td> 127.41</td><td>(CH₂=) , 128.32</td><td>(Ph), 134.78</td>

(C =), 153.58 (C =), 165.28 (C = 0).

(q) Ethyl 1-methacryloyloxymethyl carbonate (i) Ethyl chloroethyl carbonate

To a solution of chloroethyl chloroformate (23.16 g, 0.162 mol) and ethanol (7.45 g, 0.162 mol) in methylene chloride (200 mL) was added pyridine (12.82 g, 0.162 mol) at 0 ° C. After 10 minutes at 0 ° C and 21 hours at 25 ° C, the reaction mixture was washed with aqueous hydrochloric acid (100 mL) and water (100 mL). After drying (MgSO 4), the solvent was removed under reduced pressure to give 18.5 g (74%) of the crude ethyl chloroethyl carbonate intermediate.

^r1 H NMR (60 MHz, CDCl 3)₃): δ 1.30 (t, 3H, CH₃), 1.85 (d, 3H, CH)₃CH), 4.25 (kv, 2H, CH₂), 6.45 (kv, 1H, CH).

(ii) Ethyl 1-methacryloyloxyethyl carbonate

Potassium tert. butoxide (3.70 g, 0.033 mol) was added to a solution of methacrylic acid (2.84 g, 0.033 mol) in DMF (100 ml). Ethyl chloroethyl carbonate (5.08 g, 0.033 mol) from Example lq (i) was added to the resulting suspension. 18-crown-6 (0.61 g, 2.3 mmol) was then added to reaction mixture 1 and the reaction mixture was stirred at room temperature for 3 days. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was dissolved in chloroform (100 mL) and washed with saturated aqueous sodium bicarbonate (50 mL) and water. The organic phase is dried (MgSO 4)₄) and the solvent was separated under reduced pressure. Flash chromatography gave 2.50 g (38%) of the title product. (The yield of starting material for recovery was found to be 78%).

^X1 H NMR (60 MHz, CDCl 3)₃): δ 1.30 (t, 3H, CH₃CH₂), 1.60 (d, 3H, CH)₃CH), 2.00 (s, 3H, CH₃C =), 4.20 (kv, 2H, CH)₂) ,

5.70 (m, 1H, CH)₂=), 6.25 (kv, 1H, -OCH (CH₃O-), 6.90 (m, 1H, CH)₂) .

(r) Methacryloyloxymethyl benzoate

Potassium tert. butoxide (10.0 g, 0.090 mol) was added to a solution of methacrylic acid (7.75 g, 0.090 mol) in DMF (300 ml). Chloromethyl benzoate was added to the resulting suspension²(Benneche T., Strande P., Wiggen U., Actą Chem. Scand. 43, 1988, p. 74) [2] (15.0 g, 0.088 mol). Then added

18-crown-6 (1.8 g, 6.9 mmol) and the reaction mixture was stirred at room temperature for 2 days. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was dissolved in chloroform (100 mL) and washed with saturated aqueous sodium bicarbonate (50 mL) and water (50 mL). The organic phase is dried (MgSO 4)₄) and the solvent was separated under reduced pressure. Flash chromatography gave 15.9 g (82%) of the title product.

^X1 H NMR (60 MHz, CDCl 3)₃): δ 2.00 (s, 3H, CH)₃C =), 5.65 (m,

1H, CH₂=), 6.15 (s, 2H, -OCH)₂O-), 6.35 (m, 1H, CH)₂=) ,

7.50 (m, 3, Ph), 8.05 (m, 2H, Ph).

s) N- (2-Acetoxymethoxycarbonyloxypropyl) methacrylamide (i) N- (2-Chloromethoxycarbonyloxypropyl) methacrylamide

To a solution of N- (2-hydroxypropyl) methacrylamide (Stroholm Kopecek J., Angew. Macromol. Chemie, 70, 1978, p. 109) [3] (2.86 g, 20 mmol) and pyridine (1.90 g, 24 mmol) were added. chloride (100 mL) was added chloromethyl chloroformate (3.87 g, 30 mmol) in methylene chloride (120 mL) at 0 ° C. After 15 minutes at 0 ° C and 24 hours at 25 ° C, the reaction mixture was washed with water (5 x 25 mL). After drying (MgSO4), the solvent was removed under reduced pressure and flash chromatography (silica gel, chloroform) gave 3.30 g (70%) of the title compound.

NMR (60 MHz, CDCl 1)₃): δ 1.42 (d, 3H, CH)₃-CH-O), 2.0 (m, 3H, CH)₃C =), 3.2-4.0 (m, 2H, NH-CH)₂-CH), 4.8-5.3 (m, 1H, CH 3 -CH-O), 5.3 (m, 1H, CH)₂-), 5.70 (m, 1H, CH₂), 5.7 (s, 2H, CH)₂C1), 6.1-6.7 (pi s, 1H, NH).

(ii) N- (2-Acetoxymethoxycarbonyloxypropyl) methacrylamide

Method:

A solution of TBA acetate (1.21 g, 4 mmol) in THF (30 mL) prepared by freeze-drying an aqueous solution of equimolar TBA-OH and acetic acid was added to stirred N (2-chloromethoxycarbonyloxypropyl) methacrylamide (0.943 g, 4 mmol) from ls (i). ) e.g. solution in THF (10 mL) at room temperature. After 5 days of stirring, the solvent was removed under reduced pressure. The residue was dissolved in chloroform (50 mL) and washed with water (5 x 10 mL). The organic phase is dried (MgSO 4)₄) and the solvent was separated under reduced pressure. Flash chromatography (silica gel, hexane 3216 Bas / ethyl acetate (3: 4)) gave 0.486 g (47%) of the title compound.

^l1 H NMR (60 MHz, CDCl 3)₃): δ 1.4 9d, 3H, CH₃-CH-O), 2.0 (s, 3H, CH)₃C-), 2.2 9s, 3H, CH₃O), 3.2-4.0 (m, 2H, NH-CH)₂CH), 4.8-5.3 (m, 1H, CH)₃-CH-O), 5.3 (m, 1H, CH)₂=), 5.70 (m, 1H, CH₂=), 5.8 (s, OCH₂O), 6.1-6.7 (pl s, 1H, NH).

way:

To a solution of N- (2-hydroxypropyl) -methacrylamide [3] (0.430 g, 3.0 mmol) and pyridine (0.285 g, 3.6 mmol) in methylene chloride (30 mL) was added acetoxymethyl chloroformate (0.500 g, 3.3 mmol) in methylene chloride (6). ml) at 0 ° C. After 10 minutes at 0 ° C and 3 days at room temperature, the reaction mixture was washed with water (100 mL). After drying (MgSO₄), the solvent was removed under reduced pressure. Flash chromatography (silica gel, hexane / ethyl acetate (3: 4)) gave 0.40 g (51%) of the title compound.

The NMR data were in good agreement with the above data.

t) N- [2- (1-Acetoxyethoxycarbonyloxy) propyl] methacrylamide (i) N- [2- (1-Chloroethoxycarbonyloxy) propyl] methacrylanide

To N- (2-hydroxypropyl) methacrylamide [3] (3.15 g,

A solution of 22mmol) and pyridine (2.088 g, 26.4 mmol) in methylene chloride (100 mL) was added 1-chloroethyl chloroformate (4.718 g, 33 mmol) in methylene chloride (20 mL) at 0 ° C. After 10 minutes at 0 ° C and 5.5 hours at 25 ° C, the reaction mixture was washed with water (5x40 mL). After drying (MgSO₄), the solvent was removed under reduced pressure to give 4.84 g (88%) of the title product.

^X1 H NMR (60 MHz, CDCl 3)₃): δ 1.37 (d, 3H, CH)_a-CH (Cg₃) O-),

1.83 (d, 3H, CH 3 -CH-Cl), 1.97 (m, 3H, CH₃C =), 3.3-3.6 (m, 2H, NH-CH)₂-CH), 4.7-5.3 (m, 1H, CH)₂-CH (CH₃-O), 5.3 (m, 1H, CH)₂=), 5.7 (m, 1H, CH₂=), 6.0-6.6 (m, 2H, NH + Cl-CH-CH)₃) .

(ii) N- [2- (1-Acetoxyethoxycarbonyloxy) propyl] methacrylamide

TBA Acetate (6.93 g, 23 mmol) in THF (100 mL), prepared by freeze-drying an aqueous solution of equimolar TBA-OH and acetic acid, added to stirring N [2-chloroethoxycarbonyloxy] propyl] methacrylamide (4.736 g, 19 mmol) from en (i) e.g. solution in THF (100 mL) at room temperature. After stirring for 4 days, the solvent was removed under reduced pressure. The residue was dissolved in chloroform (100 mL) and washed with water (5 x 20 mL). The organic phase is dried (MgSO 4)₄) and the solvent was separated under reduced pressure. Flash chromatography (silica gel, hexane / ethyl acetate (3: 4)) gave 1.29 g (25%) of the title product.

<td colspan="2">1 H NMR (60 MHz, CDCl 3)₃)</td><td colspan="2">: δ 1.3 (d, 3H, CH₂-CH (CH₃) O-), 1.5</td>

<td>(d, 3H, O-CH (CH₃)</td><td> 0),</td><td>2.0 (m, 3H, CH)₃C =), 2.1 1</td><td>(s, 3H,</td>

<td>CH₃C = O), 3.3-3.6</td><td>(m,</td><td>2H, NH-CH₂-CH), 4.7-5.3 (</td><td>&gt;, IH,</td>

<td>CH₂-CH (CH₃)-0) , 5</td><td> .4 '</td><td>(m, 1H, CH₂=), 5.7 (m, 1H,</td><td>CH₂=),</td>

6.1-6.6 (pi s, 1H, NH), 6.6-6.9 (m, 1H, O-CH (CH)₃) O).

u) Methyl 1-methacryloyloxyethyl carbonate (i) Methyl 1-chloroethyl carbonate

To a solution of 1-chloroethyl chloroformate (35.74 g, 0.25 mol) and methanol (8.00 g, 0.25 mol) in methylene chloride (300 ml) was added pyridine (19.78 g, 0.25 mol) at 0 ° C. After 10 minutes at 0 ° C and 2 days at 25 ° C, the reaction mixture was washed with aqueous hydrochloric acid (100 mL), aqueous saturated sodium bicarbonate (100 mL), and water (100 mL). After drying, the solvent was removed under reduced pressure to give 25.5 g (74%) of crude methyl 1-chloroethyl carbonate crude product.

^ΧΗ NMR (60 MHz, CDCl₃): δ 1.85 (d, 3H, CH)₃CH), 3.80 (s,

3H, CH₃O), 6.50 (kv, 1H, CH).

(ii) Methyl 1-methacryloyloxyethyl carbonate

Potassium tert. butoxide (3.70 g, 0.033 mol) was added to a solution of methacrylic acid (2.84 g, 0.033 mol) in DMF (100 ml). To the resulting suspension was added methyl 1-chloroethyl carbonate (4.55 g, 0.033 mol) from Example lu (i). Then 18-crown-6 (0.61 g, 2.3 mmol) was added and the reaction mixture was stirred at room temperature for 3 days. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was dissolved in chloroform (100 mL) and washed with saturated aqueous sodium bicarbonate (50 mL) and water (50 mL). The organic phase is dried (MgSO 4)₄) and the solvent was separated under reduced pressure. Flash chromatography gave 4.46 g (72%) of the title product.

^L1 H NMR (60 MHz, CDCl 3)₃): δ 1.65 (d, 3H, CH)₃CH), 2.00 (s, 3H, CH₃C =), 3.90 (s, 3H, CH)₃O), 5.65 (m, 1H, CH)₂-), 6.25 (m, 1H, CH)₂=), 6.90 (kv, 1H, CHCH)₃) .

(v) Ethylene di (chloromethyl carbonate)

Chloromethyl chloroformate (19.12 g, 148.5 mmol) was added to an ice-cooled (0 ° C) solution of ethylene glycol (2.8 g, 50 mmol) in CH₂C1₂ (200 mL). Pyridine (8.70 g, 110 mmol) was then added and the reaction mixture was stirred for 15 minutes at 0 ° C and for 6 hours at room temperature. The reaction mixture was washed with HCl (1M, 100 mL), NaHCO₃ (water, saturated, 100 mL) and water (100 mL) and dried (MgSO 4)₄). The solvent was evaporated to give 11.88 g (96.2%) of the title product.

^L1 H NMR (60 MHz, CDCl 3)₃): δ 4.48 (m, 4H, OCH)₂CH₂O), 5.75 (s, 4H, OCH)₂C1).

(w) Acetoxymethyl chloroformate (i) O-Acetoxymethyl S-ethylcarbonothioate

O-Chloromethyl S-Ethyl Carbonothioate [1] (4.50 g,

0.028 mol) DMF (20 ml) was added to a solution of potassium acetate (2.74 g, 0.028 mol) in THF (100 ml). Then 18 crown-6 (0.22 g, 0.84 mmol) was added and the mixture was stirred at room temperature, the mixture was filtered and the solvent was removed under reduced pressure. The residue was purified by flash chromatography (silica gel, chloroform) to give 4.23 g (85%) of the title compound.

reaction mixture for days. Reactions

1 H NMR (60 MHz, CDCl 3)₃): δ 1.30 (t, 3H, CH₃CH₂), 2.20 (s,

3H, CH₃C =), 2.95 (s, 2H, CH)₂CH₃), 5.80 (s, 2H, OCH)₂O).

(ii) Acetoxymethyl chloroformate

SO₂C1₂ (2.43 g, 0.018 mol) was added to 0A-acetoxymethyl S-ethyl carbonothioate (lw (i) e.g. 3.15 g, 0.018 mol) at 0-5 ° C with stirring for 15 minutes followed by stirring at room temperature for 45 minutes. The EtSCl was evaporated at room temperature and 11 mm Hg gave a colorless liquid. Yield: 2.44 g (89%).

⁷Η NMR (60 MHz, CDCl1)₃): δ 2.20 (s, 3H, CH)₃C = O), 5.76 (s, 2H, OCH)₂O).

(x) Hexamethylene di (chloromethyl carbonate)

Chloromethyl chloroformate (19.12 g, 148.5 mmol) was added to an ice-cooled solution of 1,6-hexanediol (5.90 g, 50 mmol) in CH₂C1₂ (200 mL). Pyridine (8.70 g, 110 mmol) was then added and the reaction mixture was stirred for 15 minutes at 0 ° C for 5 hours. The reaction mixture was washed with HCl (1M, 100 mL), water (100 mL) and dried (MgSO₄). The solvent was evaporated and obtained

13.25 g (95%) of the title product.

^L1 H NMR (60 MHz, CDCl 3)₃): δ 1.20-2.00 (m, 8H, (CH₂)₄), 4.22 (t, 4H, 2x (CH₂O), 5.73 (s, 4H, 2x (CH₂Cl).

y) Methacryloyloxymethyl acetate

Potassium tert. butoxide (5.0 g, 0.045 mol) in DMF (150 ml) was added to a solution of methacrylic acid (3.87 g, 0.045 mol). Chloromethyl acetate was added to the resulting suspension³(4.86 g, 0.045 mol). 18-Crown-6 (0.9 g, 3.45 mmol) was then added and the reaction mixture was stirred at room temperature for 4 days. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was dissolved in chloroform (100 mL) and washed with saturated aqueous sodium bicarbonate (50 mL) and water (50 mL). The organic phase is dried (MgSO 4)₄) and the solvent was separated under reduced pressure. Flash chromatography gave 5.19 g (75%) of the title product.

⁷Η NMR (60 MHz, CDCl1)₃): δ 2.00 (s, 3H, CH)₃C =), 2.18 (s,

3H, CH₃C = O), 5.70 (m, 1H, CH)₂=), 5.85 (s, 2H, -OCH₂O-),

6.25 (m, 1H, CH)₂) .

z) Butyl acryloyl oxymethyl carbonate

Potassium tert. butoxide (5.84 g, 0.052 mol) was added to a solution of acrylic acid (4.47 g, 0.045 mol) in DMF (220 ml). To the resulting suspension was added DMF (150 mL) butyl chloromethyl carbonate (ii, e.g. 6.5 g, 0.052 mol). 18-Crown-6 (0.6 g) was then added and the reaction mixture was stirred at room temperature for 2 days. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was dissolved in chloroform (100 mL) and washed with saturated aqueous sodium bicarbonate (50 mL) and water (50 mL). The organic phase is dried (MgSO 4)₄) and the solvent was separated under reduced pressure. Flash chromatography gave 4.57 g of the title product.

^X1 H NMR (60 MHz, CDCl 3)₃): δ 0.80 (t, 3H, CH)₃CH₂), 1.28 (m, 2H, CH)₂), 1.60 (m, 2H, CH)₂), 4.15 (t, CH₂O), 5.78 (s, 2H, OCH)₂O), 5.88 (dd, 1H, CH)₂=), 6.1 (dd, 1H, CH₂=),

6.45 (dd, 1H, CH)₂= CH-).

(aa) 3,6,9-Trioxaundecandicarboxylic acid dichloride

3,6,9-Trioxaundecandicarboxylic acid (2.0 mol) was deflegmated in thionyl chloride (1 mL) for 6 hours before evaporating excess thionyl chloride under reduced pressure. The crude product is used at another stage.

^r1 H NMR (60 MHz, CDCl 3)₃): δ 3.64-3.68 (m, 4H), 3.76-3.82 (m, 4H), 4.49-4.51 (m, 4H).

¹³C NMR (CDCl₃): δ 70.70, 71.29, 76.65, 172.03.

ab) 1- (7-Benzyloxycarbonylheptanyloxy) ethyl decyl carbonate (i) 1-Benzylnonandicarboxylic acid

A solution of non-dicarboxylic acid (25.0 g, 0.13 mol) in benzene (556 mL) was added to p-toluenesulfonic acid (0.71 g, 3.72 mmol) and heated to 80 ° C. Benzyl alcohol (14.3 g, 0.13 mol) in benzene (50 mL) was added dropwise. The reaction mixture was refluxed overnight. The water was removed from the reaction mixture and collected in a Dean Stark tube. After 24 hours, no benzyl alcohol was found by thin layer chromatography. The reaction mixture was cooled to room temperature, then in an ice bath. The precipitated unreacted nonandicarbonic acid was isolated by filtration. The filtrate was concentrated to dryness. The residue was purified by column chromatography using dichloromethane / methanol (10: 1) as eluent.

Yield: 28%.

^r1 H NMR (300 MHz, CDCl 3)₃): δ 7.35-7.31 (m, Ar); 5.10 (s,

ArCH₂); 2.33 (t, CH₂CO); 1.62 (m,. CH₂CH₂CO); 1.29 [m, (CH₂)₃] .

(ii) Cesium 1-benzylnononioate

1-Benzylnonandicarbonic acid (lac (i) e.g. 6.3 g, 21.6 mmol) was suspended in distilled water (100 mL) and heated to 50 ° C. Cesium carbonate (3.5 g, 10.8 mmol) in water (20 mL) was added dropwise to pH 7. The water was separated by lyophilization for 2 days.

Yield 95%.

(iii) 1-Chloroethyl decyl carbonate

To a stirred solution of decanol (6.0 g, 7.23 mmol) in dichloromethane (150 mL) was added dry pyridine (3.66 mL, 45.6 mmol). The solution was chilled in an ice bath. 1-Chloroethyl chloroformate (6.5 g, 45.6 mmol) was added dropwise. The reaction mixture was left overnight, diluted with dichloromethane and washed with 0.5 N HCl solution, twice saturated sodium bicarbonate solution and finally distilled water. The solvent was dried over magnesium sulfate, filtered through silica, and concentrated to dryness.

Yield 93%.

^X1 H NMR (300 MHz, CDCl 3)₃): δ 6.43 (q, CHCl 1); 4.19 (t,

CH₂O); 1.83 (d, CH₃CH); 1.69 (CH₂CH₂O); 1.40-1.22 [m, (CH₂)₈]; 0.88 (t, CH₃CH₂) .

(iv) 1- (7-Benzyloxycarbonylheptanyloxy) ethyl decyl carbonate

Cesium 1-benzylnonanodioate (lac (ii) e.g. 5.0 g, 12.2 mmol) was dissolved in DMF (150 mL). To this was added 1-chloroethyl decyl carbonate (lac (iii) e.g. 3.25 g, 12.2 mmol) followed by potassium iodide (125 mg, 0.75 mmol). The reaction was allowed to proceed for 3 days. The solvent was removed under reduced pressure. The residue was suspended in dichloromethane and washed three times with saturated sodium bicarbonate solution and finally twice with water. After drying over magnesium sulfate, the solution was evaporated to dryness. The product was purified by column chromatography using petroleum ether / ethyl acetate (12: 1) as eluent.

Yield: 65%.

^X1 H NMR (300 MHz, CDCl 3)₃): δ 7.35-7.31 (m, Ar); 6.78 (sq,

OCHCH 3 O); 5.10 (s, ArCH₂); 4.19 (t, CH₂O); 2.33 (t,

CH₂CO).

(v) 1- (7-Carboxyheptanoyloxy) ethyl decyl carbonate

To a solution of 1- (7-benzyloxycarbonylheptanoyloxy) ethyl decyl carbonate (lac (iv) e.g. 4.0 g, 7.9 mmol) in acetic acid (15 mL) was added catalytic palladium / charcoal (150 mg). The mixture is hydrogenated with H₂ at room temperature for 5 hours. The acetic acid was separated under reduced pressure. The residue was purified by column chromatography using n-heptane / ethyl acetate (4: 1) as eluent.

Yield: 52%.

^X1 H NMR (300 MHz, CDCl 3)₃): δ 6.76 (kv, OCHCH₃O); 4.19 (t, CH₂O); 2.32 (t, CH₂CO).

¹³C NMR (300 MHz, DMSO)₆) δ 174.67 (COOH); 171.30 (CH₂COO); 152.68 (OCOO); 91.09 (OCHCH₃) .

ac) Nonylcarbonyloxymethyl chloroformate (i) Potassium decanoate

A solution of KOH (2.6 g, 46.4 mmol) in water (50 mL) was added dropwise to a suspension of decanoic acid (8.0 g, 46.4 mmol) in water (300 mL) at 60 ° C until the pH reached 7. Water was lyophilized.

Yield: 9.28 g (95%).

(ii) O-Nonylcarbonyloxymethyl S-ethylcarbonothioate

O-Chloromethyl S-Ethyl Carbonothioate [1] (4.79 g,

0.031 mol) DMA (20 ml) was added to a suspension of potassium decanoate (lad (i) e.g. 6.5 g, 0.031 mol) in DMA (500 ml). 18-Crown-6 (0.25 g, 0.93 mmol) was then added and the reaction mixture was stirred at room temperature for 22 hours. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was purified by flash chromatography (silica gel, hexane / ethyl acetate (30: 1)).

Yield: 5.96 g (67%).

^T1 H NMR (300 MHz, CDCl 3)₃): δ 0.88 (t, 3H, CH)₃(CH₂)₈, 1.27 (m, 12H, (CH₂)₆), 1.33 (t, 3H, CHCH)₂S), 1.63 (m, 2H,

CH₂CH₂= O), 2.37 (t, 2H, CH₂C = O), 2.89 (s, 2H, CH)₂S),

5.81 (s, 2H, OCH₂O).

¹³C NMR (300 MHz, CDCl 3)₃) δ 14.1, 14.8, 22.7, 24.6, 25.4, 29.0, 29.2, 29.3, 29.4, 31.9, 33.9, 80.2, (OCH₂O),

170.7 (C = O), 172.2 (C = O).

(iii) Nonylcarbonyloxymethyl chloroformate

SO₂C1₂ (1.17 g, 8.65 mmol) was added to 0-nonylcarbonyloxymethyl S-ethyl carbonothioate (lad (ii) e.g. 2.10 g, 7.22 mmol) CH₂C1₂ (5 mL) at 0 ° C with stirring for 15 minutes, followed by stirring at room temperature for 17 hours. The EtSCl was evaporated at 30 ° C to give a yellow liquid.

Yield: 1.62 g (85%).

³1 H NMR (300 MHz, CDCl 3)₃): δ 0.88 (t, 3H, CH)₃), 1.27 (m,

12H, (CH₂)₆), 1.66 (m, 2H, CH)₂CH₂C = O), 2.41 (t, 2H,

CH₂C = O), 5.82 (s, 2H, OCH)₂O).

¹³C NMR (300 MHz, CDCl 3)₃) δ 14.1, 22.7, 24.5, 29.0,

29.19, 29.24, 29.4, 31.9, 33.8, 83.3 {OCH₂O), 150.1 (Cl = O), 171.7 (C = O).

ad) 1-Acetoxy-1-phenylmethyl vinyl carbonate (i) 1-Chloro-1-phenylethyl vinyl carbonate

Vinyl chloroformate (3.0 g, 0.028 mol) and benzaldehyde (4.14 g, 0.039 mol) were dissolved in 1,2-dichloroethane (30 ml) and pyridine (0.1 g, 1.28 mol) was added dropwise to the stirred solution. The solution was stirred for 1 day at 80 ° C, washed with water (25 mL), and the aqueous phase was extracted with methylene chloride (25 mL). The combined organic phases were dried (MgSO 4)₄) and concentrated to give 3.0 g (50%) of the title product.

⁴1 H NMR (60 MHz, CDCl 3)₃): δ 4.55 (dd, 1H, CH)₂=), 4.95 (dd, 1H, CH₂=). 7.05 (dd, 1H, CH₂= CH-), 7.25 (s, 1H, CH-Ph), 7.40 (m, 5H, Ph).

(ii) 1-Acetoxy-1-phenylmethyl vinyl carbonate

Silver acetate (2.0 g, 0.012 mol) was added to a solution of 1-chloro-1-phenylmethyl vinyl carbonate (2.50 g, 0.012 mol) in DMF (60 mL). The reaction mixture was stirred at room temperature for 12 hours. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was purified by flash chromatography (silica gel, methylene chloride) to give 0.56 g (20%) of the title product.

^L1 H NMR (60 MHz, CDCl 3)₃): δ 2.24 (s, 3H, CH)₃C = O), 4.60 (dd, 1H, CH)₂=), 4.95 (dd, 1H, CH₂=), 7.00 (dd, 1H, CH =),

7.50 (m, 5H, Ph), 8.00 (s, 1H, -CH-Ph).

ae) Benzoyloxymethyl chloroformate (i) O-Benzoyloxymethyl S-ethyl carbonothioate

O-Chloromethyl S-Ethyl Carbonothioate [1] (5.73 g,

0.037 mol) DMF (20 ml) was added to a solution of potassium benzoate (5.94 g, 0.037 mol), then 18-crown-6 (0.485 g, 1.85 mmol) in DMF (130 ml) was added and the reaction mixture was stirred at room temperature for 24 hours. . The solvent was removed under reduced pressure. The residue was dissolved in chloroform (150 ml) and washed with water and dried (MgSO₄). The solvent was removed under reduced pressure and purified by flash chromatography (silica gel, chloroform) to give 7.16 g (81%) of the title product.

^ΧΗ NMR (60 MHz, CDCl1)₃): δ 1.3 (t, 3H, CH₃), 2.9 (q, 2H, CH₂CH₃), 6.1 (s, 2H, OCH)₂O), 7.3-7.7 (m, 3H, Ph), 8.08.2 (m, 2H, Ph).

(ii) Benzoyloxymethyl chloroformate

SO₂C1₂ (4.03 g, 0.030 mol) of O-benzoyloxymethyl-5-ethylcarbonothioate (7.16 g, 0.030 mol) was added at 0-5 ° C with stirring for 15 minutes, followed by stirring at room temperature for 2 hours. The EtSCI was evaporated at room temperature and 11 Yield: 5.30 g (83%).

^X1 H NMR (60 MHz, CDCl 3)₃): δ 6 (m, 3H, Ph), 8.0-8.2 (m, 2H, mm Hg) gave a yellow liquid.

(s, 2H, OCH₂O), 7.3-7.7

Ph).

EXAMPLE-Synthesis of Polymers

a) Emulsion copolymerization of methylene dimethacrylate and styrene in ml at 1% w / v a solution of sodium dodecyl sulfate in water was heated to 60 ° C under a nitrogen atmosphere. 0.20 g (1.09 mmol) of methylene dimethacrylate from la e.g. and 9.80 g (0.094 mol) of styrene monomer were added with vigorous stirring. The polymerization was initiated by an oxidation-reduction system of metabisulfite / persulfate consisting of 1.6 mg (7.2 mmol) of potassium metabisulfite and 0.08 mg (0.3 mmol) of potassium persulfate. The polymerization was allowed to proceed for 8 hours, then cooled to room temperature. The resulting emulsion contained 11.2% solids, which corresponds to a conversion rate of 68%. The regenerated polymer was insoluble in THF, was a good solvent for polystyrene, showing that the polymer was crosslinked.

(b) Polymer of methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride

A solution of adipoyl chloride (0.657 g, 3.59 mmol) in xylene / trichloroethylene (80:20 by weight, 5 mL) was added dropwise to methylene bis (16-hydroxyhexadecanoate) (2.000 g, 3.59 mmol) from lb (iv). a solution of xylene / trichlorethylene (80:20 by volume, 160 mL) at 60 ° C. After 44 hours at 60 ° C under reduced pressure, the reaction mixture was cooled to 20 ° C and the solvent evaporated under reduced pressure to give 0.227 g of a white solid.

IR (pure), cm¹: 2915 (st), 1759, 1732 (st), 1466, 1417 (s), 1380, 1263, 1175 (s), 1105 (s), 991 (s), 798 (s), 726.

^X1 H NMR (300 MHz, CDCl 3)₃): δ 1.58 (m, 44H, CH)₂), 1.63 (m,

12H, CH₂), 2.29 (m, 8H, CH)₂CO), 4.04 (m, 4H, 2X CH)₂O),

5.73 (m, 2H, --OCH)₂O-).

Molecular Sieve Chromatography (SEC):

Mw = 11100, Mn = 6500, Mp = 14100, Mw / Mn = 1.7.

c) Polymer of methylene bis (12-hydroxydodecanoate) and adipoyl chloride

A solution of adipoyl chloride (1.22 g, 6.7 mmol) in xylene / trichlorethylene (80:20 by weight, 5 mL) was added dropwise to methylene bis (12-hydroxydodecanoate) (3.00 g, 6.7 mmol) from 1c. xylene / trichloroethylene (80:20 by volume, 100 mL) at 60 ° C. After 4 days at 60 ° C under reduced pressure, the reaction mixture was cooled to 20 ° C, the solvent was evaporated under reduced pressure to give a yellow solid. The compound was purified by flash chromatography (silica / eluent from chloroform to ethyl acetate).

Molecular Sieve Chromatography (SEC): Mw = 18276,

Mn = 12840, Mw / Mn = 1.423.

d) Polymer of methylene bis (10-hydroxydecanoate) and succinyl chloride

Succinyl chloride (0.200 g, 1.29 mmol) was added to methylene bis (10-hydroxydecanoate) (0.500 g, 1.29 mmol) from ld. solution in toluene (60 mL) at 70 ° C. After 100 hours at 70 ° C under reduced pressure, the reaction mixture was cooled to 20 ° C and the solvent was evaporated under reduced pressure to give 0.435 g of a yellow solid.

IR (pure): 2933 (st), 1787, 1738 (st), 1650, 1465 (s), 1413 (s), 1357 (s), 1262 (s), 1164, 1099 (s), 1049 (s) , 988, 906, 802 cm '¹.

^X1 H NMR (300 MHz, CDCl 3)₃): δ 1.25 (m, 20H, CH)₂), 1.57 (m,

8H, CH₂), 2.32 (m, 4H, CH)₂CO), 2.61 (m, 4H, CH)₂CO), 4.04 (m, 4H, 2 X CH)₂O), 5.70 (s, 2H, -OCH)₂O-).

Molecular Sieve Chromatography (SEC): Mw = 1870,

Mn = 1580, Mp = 1310, Mw / Mn = 1.18.

e) Oligomer of methylene bis (10-hydroxydecanoate) and succinic acid

Succinic acid (0.152 g, 1.29 mmol) was added to methylene bis (10-hydroxydecanoate) (0.500 g, 1.29 mmol) from ld. and a solution of p-toluenesulfonic acid (0.007 g, 0.004 mmol) in toluene (12 mL) at 130 ° C. After 84 hours at 140 ° C, the reaction mixture was cooled to 20 ° C with constant removal of water by distillation. The solvent was evaporated under reduced pressure to give 0.425 g of a yellow solid.

IR (pure): 2933 (st), 1739 (st), 1650, 1467 (s),

1415, 1360 (s), 1261, 1168, 1100, 995, 803, 724 cm '¹.

^X1 H NMR (300 MHz, CDCl 3)₃): δ 1.27 (m, 20H, CH)₂), 1.59 (m, 8H, CH)₂), 2.33 (m, 4H, CH)₂CO), 2.64 (m, 4H, CH)₂CO), 4.05 (m, 4H, 2 X CH)₂O), 5.72 (s, 2H, -OCH)₂O-), 10.00 (pis, 2H).

Molecular Sieve Chromatography: The polymer was shown not to form (oligomers alone).

f) Polymer of methylene bis (10-hydroxydecanoate) and adipoyl chloride

A solution of adipoyl chloride (0 in xylene / trichloroethylene, dropwise to methylene .943 g, 5.15 mmol) (80:20 by weight, 7 mL) bis (10-hydroxydecanoate) (2.000 g, 5.15 mmol) from ld. xylene / trichlorethylene (80:20 by volume, 120 mL) at 60 ° C. After 48 hours at 60 ° C under reduced pressure, the reaction mixture was cooled to 20 ° C and the solvent was evaporated under reduced pressure to give a white solid. Flash chromatography (silica, ethyl acetate) gave 0.44 g of a polymer fraction.

³Η NMR (300 MHz, CDCl1)₃): δ 1.32 (m, 20H, CH)₂), 1.57 (m,

12H, CH₂), 2.34 (m, 8H, CH)₂CO), 4.03 (m, 4H, CH)₂CO),

4.04 (m, 4H, 2 X CH₂O), 5.71 (s, 2H, -OCH)₂O-).

Molecular sieve chromatography: Mw = 20964, Mn = 12382,

Mp = 22843, Mw / Mn = 1.693.

(g) Polymer of bis (chlorocarbonyloxymethyl) terephthalate and 1,6-diaminohexane

1,6-Diaminohexane (0.23 g, 0.002 mol) and triethylamine (0.40 g, 0.004 mol) in THF (5 ml) were added to bis (chlorocarbonyloxymethyl) terephthalate (0.70 g, 0.002 mol) from le (ii) e.g. solution in THF (20 mL). The reaction mixture was stirred for 6 days at room temperature. The reaction mixture was filtered and the solvent was removed under reduced pressure to give a polymer which was insoluble in chloroform.

^ΧΗ NMR (300 MHz, CDCl1)₃): δ 1.20 (m, 8H, 4 x CH)₂), 2.853.20 (m, 6H, 2 x NH and 2 x CH)₂N, 5.85 (s, 2H, OCH)₂O), 8.00 (s, 4H, Ar).

h) Polymer of methylene bis (4-hydroxymethylbenzoate) and adipoyl chloride

A solution of adipoyl chloride (1.26 g, 6.89 mmol) in 1,1,2,2-tetrachloroethane / trichloroethylene (80:20 by weight, 5 mL) was added dropwise to methylene bis (4-hydroxymethyl benzoLT 3216 B ato) (2.18 g, 6.89 mmol) from lf e.g. solution of 1,1,2,2-tetrachloroethane / trichloroethylene (80:20 by weight, 90 ml) at 60 ° C. After 4 days at 60 ° C under reduced pressure, the reaction mixture was cooled to 20 ° C and the solvent was evaporated under reduced pressure to give 2.82 g of a brown viscous oil. Precipitation in methanol gave 0.80 g of a yellow compound.

Molecular sieve chromatography: Mw = 3793, Mn = 2715,

Mp = 2,845, Mw / Mn = 1,724.

^X1 H NMR (200 MHz, CDCl 1)₃): δ 1.65 (s br, 4H, CH₂), 2.40 (s br, 4H, CH)₂CO), 5.18 (s, 4H, O-CH)₂-Ph), 6.25 (s, 2H, OCH)₂O), 7.4-7.6 (m, 4H, Ph), 7.9-8.1 (m, 4H, Ph).

i) -m) General Method for Polymerization of Methacryloxyoxymethyl Carbonates

Methacryloyloxymethyl carbonate (1.0 g) from 1 1-p e.g. DMF (8.0 g) was heated to 60 ° C and AIBN (0.005 g, 0.03 mmol) was added. After 24 hours, the reaction mixture was cooled and the polymer solution was added dropwise to the stirred methanol (not solvent). The polymer was filtered off and washed with methanol and water, dried under reduced pressure.

(i) Polymer of methyl methacryloyl oxymethyl carbonate

IR (KBr): 1763 (C = 0, str.) Cm¹^X1 H NMR (300 MHz, CDCl 3)₃): δ 1.00 (m, 2H, CH)₂), 1.90 (m,

3H), 3.85 (s, 3H, CH)₃O), 5.70 (s, 2H, OCH)₂O).

^XC NMR (75 MHz, CDCl 3)₃): δ 46.35 (C-CH₃), 56.55 (CH₃O),

83.59 (-OCH₂0-), 154.41 (C = 0), 175.50 (C = 0).

A differential scanning calorimeter (DSC) showed a Tg = 59.8 ° C and an initial decomposition temperature of 242.2 ° C.

Thermal mechanical analysis showed a glass transition temperature of 59.9 ° C.

Molecular sieve chromatography: Mw = 100,000, Mn = 59,000, Mw / Mn = l.7.

(j) Polymer of ethyl methacryloyl oxymethyl carbonate

IR (KBr): 1763 (C = 0, str.) Cm¹^X1 H NMR (300 MHz, CDCl 3)₃): δ 1.00 (m, 2H, CH)₂), 1.32 (t,

3H, CH₃), 1.90 (m, 3H, CH)₃), 4.25 (m, 2H, CH)₂O), 5.70 (s, 2H, OCH)₂O).

¹³C NMR (75 MHz, CDCl 3)₃): δ 15.77 (-OCH₂O-), 46.35 (CCH₃), 65.90 (CH₂O), 83.50 (-OCH₂O-), 153.69 (C = 0),

175.80 (C = 0).

A differential scanning calorimeter (DSC) showed a Tg = 35.9 ° C and an initial degradation temperature of 260.9 ° C. The thermal mechanical temperature showed a glass transition temperature of 31.2 ° C.

Molecular Sieve Chromatography: Mw = 34000, Mn = 20000, Mw / Mn = 1.7.

k) Polymer of butyl methacryloyl oxymethyl carbonate

IR (KBr): 1763 (C = 0) cm¹¹1 H NMR (300 MHz, CDCl 3)₃): δ 0.90 (t, 3H, CH)₃), 1.00 (m,

2H, CH₂), 1.39 (m, 2H, CH)₂), 1.70 (m, 2H, CH)₂), 1.90 (m,

3H, CH₃), 4.20 (t, 2H, CH₂O), 5.68 (s, 2H, OCH)₂O).

¹³c NMR (75 MHz, CDCl3)₃): δ 13.54 (CH₃CH₂), 18.73 (CH₂) ,

30.39 (CH₂), 46.26 (C> CH)₃), 69.72 (CH₂O), 83.67 (-OCH₂O), 153.86 (C = 0), 175.80 (C = 0).

A differential scanning calorimeter (DSC) showed an initial split temperature of 239.9 ° C (no Tg observed). Thermal mechanical analysis revealed a glass transition temperature of 24.7 ° C.

Molecular sieve chromatography: Mw = 60000, Mn = 29000,

Mw / Mn = 2.1.

(l) Polymer of decyl methacryloyl oxymethyl carbonate

IR (KBr): 1763 (C = 0, str.) Cm¹^ΤΗ NMR (300 MHz, CDCl1)₃): δ 0.90 (t, 3H, CH)₃), 0.9 (m,

3H, CH₂), 1.30 (m, 14H, CH)₂), 1.70 (m, 2H, CH)₂), 1.90 (m, 2H), 4.19 (t, 2H, CH)₂O), 5.66 (s, 2H, OCH₂O).

¹³C NMR 75 MHz, CDCl 1₃): 13.78 (CH₃), 22.34-31.57 (CH₂) ,

46.26 (C-CH₃), 68.70 (CH₂O), 83.67 (-OCH₂O-), 153.55 (C = O), 175.80 (C = O).

A differential scanning calorimeter (DSC) showed an initial degradation temperature of 232.9 ° C (no Tg observed). Thermal mechanical analysis showed a glass transition temperature of 3.3 ° C.

Molecular sieve chromatography: Mw = 160000,

Mn = 90000, Mw / Mn = 1.7.

m) Polymer of benzyl methacryloyl oxymethyl carbonate

IR (KBr): 3077 (Ph), 1763 (C = 0, str.) Cm -1¹^X1 H NMR (300 MHz, CDCl 3)₃): δ 0.95 (m, 3H, CH)₃), 1.90 (m,

2H), 5.25 (s, 2H, CH)₂O), 5.75 (s, 2H, OCH)₂O), 6.70 (s,

5H, Ph).

¹³C NMR 75 MHz, CDCl 1₃): δ 46.26 (-C-CH₃), 68.03 (OCH₂Ph), 82.02 (-OCH₂O-), 129.45 (Ph), 153.67 (C = 0),

175.80 (C = 0).

The differential scanning calorimeter (DSC) showed 10 that Tg = 31.6 ° C and the initial decomposition temperature was

197.1 ° C. Thermal mechanical analysis revealed a glass transition temperature of 32.8 ° C.

Molecular sieve chromatography: Mw = 92000, Mn = 44000,

Mw / Mn = 2.1.

n) Polymerization of Benzyl Methacryloxyoxymethyl Carbonate Free-radical Solution to give Low Molecular Weight Polymer

Benzyl methacryloyloxymethyl carbonate (0.5 g, 2.0 mmol) from lp. DMF (7.5 g) was heated to 60 ° C and allyl mercaptan (0.0015 g, 0.02 m / mol) was added along with AIBN (0.0025 g, 0.015 mmol). After 24 hours of reaction, the mixture was cooled and the polymer solution added dropwise to methanol (not solvent). The polymer was filtered off and washed with ethanol and water and dried under reduced pressure.

Molecular sieve chromatography: Mw = 22000, Mn = 14000.

(o) Polymerization of free radicals of methyl 1-methacryloxyethyl carbonate

<td>AIBN (0.005</td><td>g, 0.03</td><td>mmol)</td><td>added</td><td>to</td><td>methyl</td><td> 1-</td>

<td colspan="3">methacryloyloxyethyl carbonate</td><td>(1.0g,</td><td> 5.0</td><td>mmol)</td><td>from</td>

<td>lu (ii) e.g.</td><td>solution</td><td colspan="2">in dry THF</td><td> (8</td><td>g)</td><td>60 ° C</td>

temperature in a dry nitrogen atmosphere. After 24 hours, the reaction mixture was cooled to 20 ° C and the solvent was removed under reduced pressure. The resulting polymer was dissolved in CH₂C1₂ and re-precipitated in methanol. The methanol was separated from the polymer by filtration to give a white powder.

⁷Η NMR (200 MHz, CDClC)₃): δ 0.90 (m, 3H, CH)₃), 1.45 (s, 3H, CH)₃CH), 1.87 (m, 2H, CH)₂), 3.80 (s, 3H, CH)₃O), 6.65 (pis, 1H, CHCH)₃) .

Molecular sieve chromatography: Mw = 16033, Mn = 6641,

Mp = 16192, Mw / Mn = 2.41.

A differential scanning calorimeter (DSC) showed Tg = 57.65 ° C.

p) Polymerization of free radicals of ethyl 1-methacryloyloxyethyl carbonate

AIBN (0.033 g, 0.023 mmol) was added to ethyl 1-methacryloyloxyethyl carbonate (0.504 g, 2.49 mmol) from lq (ii) e.g. solution in dry THF (8 mL) at 50 ° C under a dry nitrogen atmosphere. After 7 hours, the reaction mixture was cooled to 20 ° C, the polymer was precipitated in methanol (50 mL) and the solution filtered. The resulting polymer was dissolved in THF, re-precipitated in methanol (70 mL) and filtered to give 0.138 g of a white powder.

^ΧΗ NMR (300 MHz, CDCl3)₃): δ 0.90 (m, 3H, CH)₃), 1.25 (s,

3H, CH₃), 1.45 (s, 3H, CH)₃), 1.87 (m, 2H, CH)₂), 4.15 (bs, 2H, -CHCH)₃) .

Molecular sieve chromatography: Mw = 26500, Mn = 18600,

Mp = 22000, Mw / Mn = 1.43.

q) Polymer of ethyl methacryloxyoxymethyl carbonate, emulsion polymerization

A solution of sodium dodecyl sulfate (0.056 g, 0.19 mmol) in water (20.5 mL) was warmed to 60 ° C under a nitrogen atmosphere, before adding ethyl methacryloyloxymethyl carbonate (5.266 g, 28.00 mmol) from e.g. The polymerization was initiated by an oxidation-reduction system of potassium metabisulfite (53.4 mg, 0.24 mmol) / potassium persulfate (4.38 g, 0.02 mmol). After 16 hours at 60 ° C, potassium persulfate (4.38 mg, 0.02 mmol) was added and the polymerization was allowed to proceed for 3 hours at 60 ° C and under nitrogen, then cooled to 20 ° C.

(r) Polymer of methacryloyl oxymethyl benzoate

AIBN (0.005 g, 0.03 mmol) was added to methacryloyloxymethyl benzoate (1.00 g, 4.55 mmol) from and e.g. solution in dry THF (8 g) at 60 ° C under a dry nitrogen atmosphere. After 24 hours, the reaction mixture was cooled to 20 ° C and the solvent was removed under reduced pressure. The resulting polymer was dissolved in methylene chloride and re-precipitated in methanol. The methanol was separated from the polymer by filtration to give a white powder.

^L1 H NMR (200 MHz, CDCl 3)₃): Δ 0.85 (m, 3H, CH)₃), 1.87 (m,

2H, CH₂), 5.70 (m, 2H, -OCH)₂O-), 7.45 (m, 3H, Ph), 8.05 (m, 2H, Ph).

Molecular sieve chromatography: Mw = 30281, Mn = 11580,

Mp = 32286, Mw / Mn = 2.615.

A differential scanning calorimeter (DSC) showed Tg = 60.98 ° C.

s) Free radical polymerization of N- (2-acetoxymethoxycarbonyloxypropyl) methacrylamide

AIBN (0.0138 g, 0.084 mmol) was added to N- (2acetoxymethoxycarbonyloxypropyl) methacrylamide (0.519 g, 2 mmol) from ls (ii) e.g. solution in dry THF (8 mL) at 50 ° C under a dry nitrogen atmosphere. After 3 days, the solvent was removed under reduced pressure to give a white powder.

<td>^L1 H NMR (200 MHz, CDCl 3)₃): δ 0.8-1.2 (m,</td><td>3H, CH₃),</td><td> 1.2</td><td> -1.4</td>

<td>(m, 3H, CH₂-CH (CH₃) O), 1.6-2.0 (m, 2H,</td><td>CH₂), 2.1</td><td>(s,</td><td>3H,</td>

<td>CH₃CO), 2.9-3.9 (m, 2H, NH-CH)₂) ,</td><td> 4.7-5.0</td><td>(m,</td><td>IH,</td>

<td>CH₂CH (CH₃) -0), 5.8 (s, 2H, O-CH)₂-O),</td><td> 6.2-7-.0</td><td>(m,</td><td>IH,</td>

NH).

Molecular sieve chromatography: Mw = 5411, Mn = 2857,

Mw / Mn = 1894.

Differential scanning calorimeter (DSC) showed Tg = 52.91 ° ​​C.

t) Free radical polymerization of N- [2- (1-acetoxyethoxycarbonyloxy) propyl] methacrylamide

AIBN (0.0031 g, 0.189 mmol) was added to N- [2- (1-acetoyloxyethoxycarbonyloxy) propyl] methacrylamide (1.23 g, 4.50 mmol) from lt (ii) e.g. solution in dry THF (18 mL) at 50 ° C under a dry nitrogen atmosphere. After 3 days, the solvent was removed under reduced pressure.

Flash chromatography (step gradient, hexane / ethyl acetate (3: 4) - methanol) gave 0.96 g of a white powder.

* Η NMR (200 MHZ, CDCl₃): δ 0.8-1.2 (m, 3H, CH)₃), 1.2-1.4 (m, 3H, CH)₂-CH (CH₃) O), 1.5 (d, 3H, O-CH (CH₃(-O), 1.6-2.0 (m, 2H, CH)₂), 2.0-2.2 (s, 3H, CH)₃CO), 2.9-3.9 (m, 2H, NH-CH)₂), 4.7-5.0 (m, 1H, CH)₂CH (CH₃) -O), 6.2-7.0 (m, 2H, NH + O-CH (CH₃) -O).

Molecular sieve chromatography: Mw = 1991, Mn = 1268,

Mp = 2105, Mw / Mn = 1.548.

A differential scanning calorimeter (DSC) showed Tg = 51.53 ° C.

u) Oligomer of ethylene di (chloromethyl carbonate) and dipotassium terephthalate

Potassium tert. butoxide (1.62 g, 0.014 mol) was added to a solution of terephthalic acid (1.20 g, 0.0072 mol) in DMF (40 mL). Ethylene di (chloromethyl carbonate) (1.78 g, 0.0072 mol) was added to the resulting suspension. 18-Crown-6 (0.056 g, 0.21 mmol) was then added and the reaction mixture was stirred at room temperature for 2 days and at 60 ° C for 11 days. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was dissolved in ethyl acetate (50 mL) and washed with saturated aqueous sodium bicarbonate (30 mL) and water (30 mL). The organic phase was dried (MgSO4 and solvent separated under reduced pressure to give the title product).

NMR (60 MHz, CDCl 1)₃): δ 4.48 (m, 4H, OCH)₂CH₂O), 6.02 (s, 4H, OCH₂O), 8.12 (s, 4H, Ar).

Molecular sieve chromatography: Mw = 1938, Mn = 1511,

Mp = 2137, Mw / Mn = 1.283.

v) Emulsion homopolymerization of free radicals of benzyl methacryloxyoxymethyl carbonate

A solution of sodium dodecyl sulfate (1.6x10 g, 5.5x10 mmol) in oxygen-free water (6.0 mL) was added to a 50 mL two-necked round bottom flask equipped with a magnetic stir bar and a condenser. To the solution was added potassium metabisulphite (0.015 g, 6.7x10²mmol) dissolved in oxygen-free water (1.0 mL) and benzyl methacryloxyoxymethyl carbonate (2.0 g, 8.0 mmol) from lp. The reaction mixture was heated to 60 ° C. To the heated reaction mixture was added potassium persulfate (1.25 x 10

-3 . ....

4.6x10 mmol) and the reaction was allowed to proceed. After about 5 hours the polymerization was stopped and the polymer emulsion was added dropwise to a large amount of methanol (not solvent). The polymer was then filtered off and washed with water. This procedure was repeated a total of 3 times to purify the polymer. The polymer was then collected and dried under vacuum to remove any residual solvent. Part of the stable emulsion was not extracted as above but stored for particle size analysis by light microscopy. The particle size of the emulsion was evaluated by optical microscopy and found to be just less than 1 µm in diameter.

w) -z) Copolymerization of a solution of free radicals of ethyl methacryloxymethyl carbonate and methacrylic acid

A monomeric feed mixture consisting of ethyl methacryloxyoxymethyl carbonate from lm ​​e.g. and DMF (8.0 g) in methacrylic acid solution heated to 60 ° C and AI BN (0.005 g, 0.03 mol) added. After 24 hours, the polymer solution was added dropwise to a stirred amount of additional chloroform (not solvent), filtered and washed with additional chloroform and dried under reduced pressure.

Table

<td>Pavyz-</td><td>Methacrylic</td><td>Ethyl methacryloyl</td><td>Molecular San-</td>

<td>dys 2</td><td>acid</td><td>oxy methyl carbo-</td><td>silence methacrylic</td>

<td></td><td>(g, mmol)</td><td>sheet (g, mmol)</td><td>acid: lm</td>

<td>w</td><td> 0.73, 8.48</td><td> 0.25, 1.33</td><td> 86:14</td>

<td>X</td><td> 0.73, 8.48</td><td> 0.17, 0.90</td><td> 90:10</td>

<td>Y</td><td> 0.73, 8.48</td><td> 0.14, 0.74</td><td> 92:8-</td>

<td>z</td><td> 0.92, 10.7</td><td> 0.08, 0.43</td><td> 96:4</td>

G NMR (200 MHz, CDCl3)₃): δ 10 (s, 6H, 2xCH)₃), 1.27 (t,

3H, CH₃CH₂), 1.90 (s, 4H, 2xCH)₂), 3.52 (bs, 1H, OH), 4.2 (m, 2H, CH)₃CH₂), 5.72 (s, -OCH₂O-)

Table: Solubility of each copolymer in hot and cold water

<td>Example 2</td><td>Solubility (cold water)</td><td>Solubility (hot water)</td>

<td>w</td><td>Insoluble</td><td>Insoluble</td>

<td>X</td><td>Insoluble</td><td>Insoluble</td>

<td>Y</td><td>Insoluble</td><td>Slightly soluble</td>

<td>z</td><td>Completely *</td><td>Absolutely</td>

Past * Complete solubility only after relatively long dissolution times.

(aa) Oligomer of hexamethylene di (chloromethyl carbonate) and dipotassium terephthalate

Potassium tert. butoxide (7.87 g, 0.068 mol) was added to a solution of terephthalic acid (5.66 g, 0.034 mol) in DMF (200 mL). Hexamethylene di (chloromethyl carbonate) (1x, e.g. 9.50 g, 0.034 mol) was added to the resulting suspension. 18-Crown-6 (0.24 g, 0.82 mmol) was then added and the reaction mixture was stirred at room temperature for 5 hours and at 60 ° C for 14 days. The reaction mixture was filtered and the solvent was removed under reduced pressure. The residue was dissolved in chloroform (100 mL) and washed with saturated aqueous sodium bicarbonate (50 mL) and water (50 mL). The organic phase is dried (MgSO 4)₄) and the solvent was removed under reduced pressure to give a yellow product.

^X1 H NMR (60 MHz, CDCl 3)₃): δ 1.25-1.90 (m, 8H, 4xCH₂), 4.20 (t, 4H, -OCH)₂CH₂), 6.00 (s, 4H, OCH)₂O), 8.10 (s, 4H,

Ar).

Molecular sieve chromatography: Mw = 2987, Mn = 1754,

Mp = 3014, Mw / Mn = 1.703.

A differential scanning calorimeter (DSC) showed Tg &lt;20 ° C.

(ab) Polymer of methacryloyl oxymethyl acetate

AIBN (0.005 g, 0.03 mmol) was added to a solution of methacryloyloxymethyl acetate (e.g. 1.00 g, 4.55 mmol) in dry THF (8 g) at 60 ° C under a dry nitrogen atmosphere. After 24 hours of reaction, the mixture was cooled to 20 ° C and the solvent was removed under reduced pressure. The resulting polymer was dissolved in CH₂C1₂ and re-precipitated in methanol. The methanol was separated from the polymer by filtration to give a white powder.

A differential scanning calorimeter (DSC) showed Tg = 54.99 ° C.

Molecular Sieve Chromatography: Mw = 184678, Mn = 2446, Mp = 54732, Mw / Mn = 7.56.

ac) Oligomer from methylene bis (10-hydroxydecanoate) and malonyl chloride

Malonyl chloride (0.254 g, 1.80 mmol) was added to a solution of methylene bis (10-hydroxydecanoate) (e.g. 0.700 g, 1.80 mmol) in xylene / trichlorethylene (80:20 by volume, 50 mL) at 60 ° C. After 77 hours at 60 ° C under reduced pressure, the reaction mixture was cooled to 20 ° C and the solvent was evaporated, yielding 0.665 g of a brown viscous liquid.

Molecular sieve chromatography: Mw = 2700, Mn = 2100,

Mp = 1600, Mw / Mn = 1.28.

ad) Polymer of ethyl 1-methacryloyloxyethyl carbonate, emulsion polymerization

A mixture of sodium dodecyl sulfate (6.5 g, 0.023 mmol) in water (2.40 mL) and potassium metabisulfite (6.3 mg, 0.028 mmol) in water (0.82 mL) was heated to 60 ° C under a nitrogen atmosphere, before adding ethyl 1-methacryloyloxyethyl carbonate (lq (ii) ) e.g. 0.617 g, 3.10 mmol). The polymerization was initiated by the addition of potassium persulfate (0.54 mg, 0.002 mmol) in water (0.25 mL). The polymerization was allowed to proceed

60 ° C under a nitrogen atmosphere, then cooled to 60 ° C for hours

20 ° C.

ae) Polymer of methylene bis (12-hydroxydodecanoate) and triphosgene

A solution of methylene bis (12-hydroxydodecanoate) (1c, e.g. 2.0 mmol) and triphosgene (0.67 mmol) in xylene / trichloroethylene 95: 5 (2 mL) was heated at 60 ° C for 50 hours under 50 mm Hg to give the polymeric material.

af) Polymer of methylene bis (12-hydroxydodecanoate) and 3,6,9-trioxaundecanodicarbonic acid dichloride

A solution of methylene bis (12-hydroxydodecanoate) (1c, e.g. 2.0 mmol) and 3,6,9-trioxaundecanodicarboxylic acid dichloride (lab, e.g. 2.0 mmol) in xylene / trichloroethylene 95: 5 (2 mL) was heated at 60 ° C for hours. 50 mm Hg and then evaporated to give the polymeric material.

ag) Dextran 10-1- (7-carboxyheptanoyloxy) ethyl decyl carbonate

To a solution of dextran 10 (0.65 g) in dry DMSO (40 mL) was added 1- (7-carboxyheptanoyloxy) ethyl decyl carbonate (lab. E.g. 1.5 g, 36 mmol), N-ethyl-N (3dimethylaminopropyl) -carbodiimide (0.83 g). , 4.3 mmol) and

4-Pyrrolidinopyridine in dry DMSO (30 mL) (42 mg, 0.28 mmol) dissolved in After stirring at room temperature for 2 days, the reaction mixture was diluted with water (250 mL) and dialyzed for 30 hours. Lyophilization of the solution gave 1.3 g of a light yellow powder.¹³In the C NMR spectrum, a new carbonyl signal appeared at 171.28 md. The remaining signals were consistent with the product structure.

ah) Polymer of Pluronic F68 and benzoyloxymethyl chloroformate

Pluronic F68 (9.889 g, 1.191 mmol) was dissolved in toluene (dry, 30 mL). After warming to 45 ° C, triethylamine (0.70 ml) was added with constant stirring. Benzyloxymethyl chloroformate (lae (ii), e.g. 1.072 g, 5.00 mmol) dissolved in toluene (4 mL) was added dropwise followed by triethylamine (0.25 mL) with toluene (dry, 2 mL). The reaction mixture was kept at 45 ° C for 8 hours, then at 55 ° C for 16 hours, and then cooled and filtered. The solvent was removed under reduced pressure and the recovered compound was dissolved in toluene and re-precipitated from n-heptane (500 mL) with stirring to give a white powder (8.45 g). IR (KBr): (C = O) cm¹.

(ai) Polymerization of free radicals of 1-Acetoxy-1-phenylmethyl vinyl carbonate

AIBN (0.005 g, 0.03 mol) is added to a solution of 1-acetoxy-1-phenylmethyl vinyl carbonate (lad (ii), e.g. 1.0 g) in dry THF (8 mL) at 60 ° C under a dry nitrogen atmosphere. After 12 hours, the solvent was removed under reduced pressure. The resulting polymer is dissolved in CH₂C1₂ and re-precipitated in a suitable solvent. The solvent was removed by filtration to give a white powder.

(aj) Copolymerization of a solution of free radicals of N- (2-hydroxypropyl) methacrylamide with N- (2-acetoxymethoxycarbonyloxypropyl) methacrylamide

N- (2-hydroxypropyl) methacrylamide [3] (0.430 g, 3.0 mmol) and N- (2-acetoxymethoxycarbonyloxypropyl) methacrylamide (ls eg 0.778 g, 3.0 mmol) were dissolved in tetrahydrofuran (10 mL) and heated to 55 ° C. AIBN (0.0207 g, 0.126 mmol) was added and the mixture was stirred at 55 ° C for 3 days to form clear jellies. They were dissolved in tetrahydrofuran and the solvent evaporated under reduced pressure to give 1.33 g of a white powder.

Molecular sieve chromatography showed the formation of a polymer.

EXAMPLE - Obtaining Polymer Particles

(a) Particles of polymer made from methylene dimethyl acrylate and styrene

Polymer emulsions from 2a e.g. a sample (13 mL) was mixed with heptane (13 mL) at room temperature. After 40 minutes, the sample was lyophilized to give the product as a white powder.

(b) Particles of polymer made of methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride

6.204 g 4.1 w / w. % of polymer from 2b e.g. of a solution of xylene / trichlorethylene (90:10) in 25 ml of 0.5 w / v. % Pluronic® F68 in water. The mixture was shaken vigorously (by hand) for one minute and freeze-dried for 16 hours. Light microscopy showed the formation of microparticles.

(c) Polymer particles of methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride

6.204 g 4.1 w / w. % of polymer from 2b e.g. of a solution of xylene / trichloroethylene (90:10) in 25 ml of 0.5 w / v. % Pluronic® F68 in water. The mixture is blended with an Ultra Turax T25 mixer at 205,000 rpm. speed for 40 seconds and freeze-dried for 16 hours. Light microscopy determined the formation of microparticles.

(d) Polymer particles of methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride

12.408g 4.1 w / w % of polymer from 2b e.g. of a solution of xylene / trichlorethylene (90:10) in 50 ml of 0.5 w / v. % Pluronic® F68 in water.

The mixture was blended with an Ultra Turax T25 mixer at 24000 rpm. speed for 40 seconds and freeze-dried for 16 hours. Light microscopy determined the formation of microparticles.

(e) Polymer particles of methylene bis (12-hydroxydodecanoate and adipoyl chloride)

The polymer from methylene bis (12-hydroxydodecanoate) from Example 2c and adipoyl chloride (0.40 g) in xylene / trichloroethylene (10: 1.4 mL) was added to 20 mL of 0.5 w / v. % Pluronic® F68 in water. The mixture was stirred with an Ultra Turax T25 mixer at 20300 rpm for 30 seconds and freeze-dried for 16 hours. Light microscopy determined the formation of microparticles.

(f) Particles of an ologimer made from ethylene di (chloromethyl carbonate) and dipotassium terephthalate

Oligomer from ethylene di (chloromethyl carbonate) and dipotassium terephthalate from 2u e.g. a solution of chloroform (22.5 ml of a 4 w / v% solution of the polymer dissolved with gentle heating) was added to 30 ml of a 0.5 w / v solution. % Pluronic® F68 in water. The mixture was blended with an Ultra Turax T25 mixer at 24000 rpm. speed for 40 seconds and freeze-dried for 16 hours. Light microscopy determined the formation of microparticles.

(g) Polymer particles made of ethyl methacryloxyoxymethyl carbonate

For example, a solution of a polymer made from ethyl methacryloxyloxymethyl carbonate from 2j, for example, in chloroform (9 ml of a 10% w / v solution) was added to 30 ml of 0.5 w / v. %

Pluronic® F68 solution in water. The mixture was stirred

With an Ultra Turax T25 mixer at 24000 rpm. speed for 40 seconds and freeze-dried for 16 hours. Light microscopy showed the formation of microparticles.

(h) Particles of a polymer made of methyl 1-methacryloyloxyethyl carbonate

Polymer of methyl 1-methacryloyloxyethyl carbonate (0.462 g) from 2o e.g. toluene (5 ml) was added to 20 ml 1.0 w / v. % Pluronic F68 in water. The mixture was blended with an Ultra Turax T25 mixer at 20500 rpm. speed for 30 seconds and freeze-dried for 16 hours. Light microscopy showed the formation of microparticles.

(i) Particles of polymer made from methacryloxyoxymethyl benzoate

Polymer of methacryloyloxymethyl benzoate (0.45 g) from 2r e.g. of toluene / trichlorethylene (10: 1), 2 mL was added to 20 mL of 1.0% w / v. Pluronic F68 solution in water. The mixture was blended with an Ultra Turax T25 mixer at 20500 rpm. speed for 30 seconds and freeze-dried (0.05 mmHg) for 4 hours. Light microscopy determined the formation of microparticles.

(j) Polymer particles made of ethyl methacryloxyoxymethyl carbonate

The polymer emulsion is prepared according to Example 2q. 14.783 g of this emulsion was added to 47.305 g of toluene. The mixture was stirred vigorously for 20 hours and freeze-dried for 16 hours to give 1.813 g of a white powder. Light microscopy and electron scanning microscopy detected the formation of microparticles.

k) Particles of polymer made from ethyl methacryloxyoxymethyl carbonate

The polymer emulsion was obtained according to Example 2q. 12.7612 g of this emulsion was added to 40.836 g of chloroform. The mixture was stirred vigorously for 20 hours and freeze-dried for 16 hours to give 1.496 g of a white powder. Light microscopy and scanning electron microscopy detected the formation of microparticles.

(l) Oligomeric particles of ethylene di (chloromethyl carbonate) and dipotassium terephthalate

Oligomer of ethylene di (chloromethyl carbonate) and dipotassium terephthalate (1.0 g) from 2u e.g. dissolved in 19.0 g of liquid naphthalene at 100 ° C. The naphthalene solution was emulsified at 90 ° C in 200 ml of a polyvinyl alcohol aqueous solution (8.0 g, Mw = 1300023000) containing Pluronic® F68 (0.2 g). Emulsification was regulated by Ultra Turax T25. The emulsion was then diluted with 500 ml of the same aqueous phase at 15 ° C and stirred for 8 minutes. The naphthalene droplets solidified into pellets that were filtered through a 50 µm filter to separate particles larger than 50 µm. The suspension was centrifuged at 1000xg and the peas were washed with water and centrifuged again. This stage was repeated twice. The peas were resuspended in 100 mL of water with 0.8 g of lactose, and the suspension was frozen in a block at -40 ° C. This block is then freeze-dried for 16 hours. Light microscopy determined the formation of microparticles.

m) Particles of polymer made from methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride in ml 3.37 w / v. A solution of% polymer (Example 2b) in xylene / trichlorethylene (90:10) was added to 10 mL of 0.5% TWeen® 80 in water. The mixture is stirred

With an Ultra Turax® T25 mixer at 20500 rpm. speed for 1 minute and 30 seconds and freeze-dried for 18 hours to give a white powder. Light microscopy determined the formation of microparticles.

n) Polymer particles made from methylene bis (16hydroxyhexadecanoate) and adipoyl chloride ml 3.37% w / v A solution of polymer (Example 2b) in xylene / trichlorethylene (90:10) was added to 10 ml of 0.5% Brij 99 in water. The mixture is blended with an Ultra Turax® T25 mixer at 20500 rpm. speed for 1 minute and 30 seconds and freeze-dried for 17 hours to give a white powder. Light microscopy determined the formation of microparticles.

(o) Polymer particles of methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride

5.5 ml 1.84 w / v A solution of% polymer (Example 2b) in xylene / trichlorethylene (90:10) was added to 10 mL of 0.5% Cremophor RH40 in water. The mixture is blended with an Ultra Turax® T25 mixer at 20500 rpm. speed for 1 minute and 30 seconds and freeze-dried for 16 hours to give a white powder. Light microscopy determined the formation of microparticles.

(p) Polymer particles of methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride

5.5 ml 1.84 w / v A solution of% polymer (Example 2b) in xylene / trichloroethylene (90:10) was added to 10 mL of 0.5% Kollidon® 30 in water. Mixture

<td>stirring</td><td>Ultra Turax®</td><td>T25</td><td>mixer</td><td> 20500</td><td>rpm</td>

<td>speed</td><td>1 minute and</td><td> 30</td><td>seconds</td><td>and</td><td>dried</td>

<td>while freezing</td><td>16 hours,</td><td>yes</td><td colspan="2">obtaining whites</td><td>powder.</td>

Light microscopy determined the formation of microparticles.

q) Polymer particles made from methylene bis (10-hydroxydecanoate) and adipoyl chloride in 2.52% w / v. A solution of% polymer (Example 2f) in xylene / trichlorethylene (90:10) was added to 10 mL of 0.5% Pluronic F68 in water. The mixture is blended with an Ultra Turax® T25 mixer at 20500 rpm. speed for 1 minute and 30 seconds and freeze-dried for 15 hours to give a white powder. Light microscopy determined the formation of microparticles.

(r) Oligomeric particles of hexamethylene di (chloromethyl carbonate) and dipotassium terephthalate

22.5 ml 4 w / v A solution of% polymer (Example 2aa) in chloroform was added to 30 ml Pluronic® F68 solution in water. The mixture is blended with an Ultra Turax® T25 mixer at 24000 rpm. speed for 40 seconds and freeze-dried for 16 hours to give a yellow, solid gum. Light microscopy determined the formation of microparticles.

s) Particles of polymer made from N- [2- (1-Acetoxycarbonyloxy) propyl] methacrylamide ml 2.55% w / v A solution of% polymer (ex. 2t) in xylene / trichlorethylene (90:10) was added to 20 ml of a 0.5 wt% Pluronic F68 solution in water. The mixture is blended with an Ultra Turax® T25 mixer at 20500 rpm. speed for 1 minute and 30 seconds and freeze-dried for 16 hours to give a white powder. Light microscopy determined the formation of microparticles.

t) Particles of polymer made from methacryloxyloxymethyl acetate 2.48% w / v. A solution of% polymer (ex. 2ab) in xylene / trichlorethylene (90:10) was added to 20 ml of a 0.5 wt% Pluronic® F68 solution in water. The mixture is blended with an Ultra Turax® T25 mixer at 20500 rpm. speed for 1 minute and 30 seconds and freeze-dried for 16 hours to give a white powder. Light microscopy determined the formation of microparticles.

u) Particles of a polymer made from N- (2-acetyloxymethoxycarbonyloxypropyl) methacrylamide ml 2.54% w / v A solution of% polymer (ex. 2s) in chloroform was added to 20 ml of a 0.5 wt% Pluronic F68 solution in water. The mixture is blended with an Ultra Turax T25 mixer at 24000 rpm. speed for 50 seconds and freeze-dried for 16 hours to give a white powder. Light microscopy determined the formation of microparticles.

(v) Particles of a polymer made from ethyl 1-methacryloyloxyethyl carbonate

The polymer emulsion is prepared by polymerizing an emulsion polymer of ethyl 1-methacryloyloxyethyl carbonate (e.g. 2ad). 2.00 g of this emulsion is added to 7.41 g of toluene. The mixture was stirred vigorously for 20 hours and freeze-dried for 16 hours to give 0.250 g of a white powder. Light microscopy determined the formation of microparticles.

w) Particles of a polymer made from ethyl 1-methacryloyloxyethyl carbonate

The polymer emulsion is prepared by polymerizing an emulsion polymer of ethyl 1-methacryloyloxyethyl carbonate (e.g. 2ad). 2.00 g of this emulsion Added to 6.40 g of chloroform. The mixture was stirred vigorously for 16 hours and freeze-dried for 16 hours to give 0.250 g of a white powder. Light microscopy determined the formation of microparticles.

(x) Polymer particles made from butyl methacryloyl oxymethyl carbonate

The polymer from butyl methacryloyloxymethyl carbonate (2k, e.g. 0.45 g) was dissolved in toluene (9 mL). Water (30 mL) containing 0.3 g Pluronic® F68 was added and the emulsion was made using a Ystral® homogenizer at 2000 rpm. 30 seconds. The emulsion was freeze-dried for 19 hours and microparticle formation was detected by light microscopy.

(y) HSA-Coated Polymer Made of Methacryloyloxymethyl Benzoate

A polymer made from methacryloyloxymethyl benzoate (2r, e.g. 0.9 g) was dissolved in toluene (9 mL). Aqueous 5% human serum albumin (HSA) solution was added to the mixture homogenized using a Ystral® homogenizer at 20,000 rpm. 30 seconds. The resulting emulsion was freeze-dried for 16 hours. Light microscopy determined the formation of microparticles.

(z) Polyoxyethylene-coated particles of a polymer made of methacryloyloxymethyl benzoate

Diblock copolymer containing one polymethyl methacrylate block (Mw «1000) and one polyoxyethylene block (POE, Mw« 2000) (0.4 g) was dissolved in toluene (9 ml). The polymer made from methacryloyloxymethyl benzoate (2r, e.g. 0.9 g) was then dissolved in a toluene solution. Water was added and the mixture was homogenized using a Ystral® homogenizer at 20,000 rpm. 30 seconds. The resulting emulsion was freeze-dried for 16 hours to give POE-coated microparticles.

(aa) Particles of polymer made from methyl methacryloxyoxymethyl carbonate

A polymer made from methyl methacryloyl oxymethyl carbonate (2o e.g. 0.9 g) was dissolved in toluene (9 mL). A mixture of sodium dodecyl sulfate (0.3 g) and Pluronic® F68 (0.025 g) in water (3 mL) was added and the solution was homogenized using a Ystral homogenizer at 20,000 rpm. 30 seconds. The resulting emulsion was freeze-dried for 16 hours. Light microscopy determined the formation of microparticles.

(ab) Polymer particles made of methylene bis (12-hydroxy-dodecanoate) and 3,6,9-trioxaunedecanodicarbonic acid dichloride

A polymer made of methylene bis (12-hydroxydodecanoate) and 3,6,9-trioxaunedecanodicarbonic acid dichloride (2af, e.g. 0.9 g) was dissolved in toluene (9 mL). Water (30 mL) containing 0.3 g Pluronic® F68 was added and the mixture was homogenized for 30 seconds using a Ystral® homogenizer at 20,000 rpm. The emulsion was freeze-dried for 48 hours and microparticle formation was detected by light microscopy.

(ac) Particles obtained by spray-drying the polymer of methacryloxymethyl benzoate

0.72 g of polymer from 2r e.g. dissolved in 60 g of dichloromethane. The solution is dried by spraying on a Buchi 190 mini spray-dryer. the inlet temperature was set at 54 ° C, and the outlet temperature was measured as 40 ° C. Light microscopy determined the formation of microparticles.

(ad) Pluronic F68 coated particles obtained by spray-drying a polymer made of methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride

1.71 g of polymer from 2b e.g. and Pluronic® 'F68 (50:50) were dissolved in 100 ml of dichloromethane. The solution was dried by spraying on a Buchi 190 mini spray dryer. The inlet temperature was set at 50 ° C and the outlet temperature was measured as 42 ° C. Light microscopy determined the formation of microparticles.

(ae) Coating of particles made of a polymer of methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride

The particles prepared according to Example 3c were re-dispersed in several aqueous solutions of different coatings with different concentrations as shown in Table 5. Light microscopy showed improved scattering with reduced aggregation tendency.

Table

<td>Covering material</td><td>Concentration a [(w / w) :)]</td>

<td>Tween® 60</td><td> 0.1, 0.5</td>

<td>Sodium hexadecanoate</td><td> 0.1, 0.5</td>

<td>Cetyl trimethyl ammonium chloride</td><td> 0.1, 0.5</td>

<td>Kollidon 30 (Polyvinyl Pyrrolidone)</td><td> 0.2, 1.0</td>

<td>Cremorphor® RH 40</td><td> 0.2, 1.0</td>

<td>Pluronic® F68</td><td> 1.0</td>

af) Pluronic F68 Coated Polymer Particles of Methyl Methacryloxyoxymethyl Carbonate

The polymer made from methyl methacryloyl oxymethyl carbonate (2i, e.g. 0.9 g) is dissolved in toluene (9 ml). Water (30 mL) containing cetyl trimethyl ammonium chloride (0.4 g) was added and the mixture was homogenized using a Ystral® homogenizer. The emulsion is freeze-dried for 24 hours. The resulting particles are washed several times with distilled water to remove the surfactant. After the last wash, the particles are freeze-dried for 24 hours.

EXAMPLE - Acoustic Characterization

General procedure

The polymer particles prepared according to Example 3, the dry powder, were again dispersed in an aqueous solvent by shaking on a laboratory shaker for 12-16 hours. Inspection by light microscopy detected the formation of particle dispersions. The particles dispersed rapidly, as expected from the gas-containing particles.

The acoustic effect of the above suspensions was obtained by measuring ultrasonic transmission through suspensions of different concentrations (mg / ml) in aqueous carrier fluid using a 3.5 MHz broadband sensor in the pulse reflectance method. Pure carrier fluid was used as a standard and measurements were made at dilution where the starting material was serially diluted with carrier fluid. Measurements were taken until the signal was reduced to about 3-5 db / cm. The resulting acoustic effects were of such a level that the products could be expected to be useful as ultrasound contrast agents. Theoretically, solid particles of the same size and dilution should give acoustic damping less than 0.1 db / cm at the same dilution.

(a) Characterization of polymer particles made from methylene dimethacrylate and styrene

The particles were from a polymer made from methylene dimethacrylate and styrene. The product showed a strong effect on acoustic transmission, decreasing with increasing response volume, as seen in FIG.

b) -i) Characterization of various polymer particles

The results are shown in Table 6 and Figures 2-9.

Table

Acoustic measurements of particles from Example 3

<td>Pavyz-</td><td>Particles 3 E.g.</td><td>Particles almost. [mg / ml]</td><td>Fig.</td>

<td>dys 4</td><td>vand. medium</td><td>at db / cm</td><td>no.</td>

<td>b</td><td>b, 0.9% w / w NaCl (wt)</td><td> 0.9</td><td> 2</td>

<td>c</td><td>c, 0.9% w / w NaCl (wt)</td><td> 0.2</td><td> 3</td>

<td>d</td><td>d, 0.9% w / w NaCl (wt)</td><td> 0.5</td><td> 4</td>

<td>e</td><td>h, water</td><td> 1.0</td><td> 5</td>

<td>f</td><td>i, water</td><td> 0.9</td><td> 6</td>

<td>g</td><td>y, water</td><td> 0.1</td><td> 7</td>

<td>h</td><td>z, water</td><td> 0.5</td><td> 8</td>

<td>i</td><td>ac, HSA / water</td><td> 2.5</td><td> 9</td>

Acoustic measurements are reported in column 3 as 20 concentrations, where the contrast effect is measured at 8 db / cm, which is the side of the saturated signal. At higher concentrations, the signal intensity increased until saturation was observed.

EXAMPLE - Characterization in the body

General methodology

The dry powder of the polymer particles described in Example 3 was redispersed in sterile 0.9% (w / w) NaCl (water) by shaking on a laboratory shaker for 12-16 hours. The dispersions were injected into Chinchillas rabbits and were measured using the Doppler technique, where the ultrasound specimen was placed directly on the carotid artery and lower iliac vein. Particle dispersions were injected into the ear vein. The height and duration of the signal were recorded. The resulting signal heights were high, demonstrating a strong ultrasound contrast effect in the body for all dispersions. Long signal duration indicates good stability in the body.

Table

Characterization of polymer particles in the body. Doses are given in pm particles per kg body weight. Signal intensity is measured in Doppler Units (DU)

<td rowspan="2">Example 5</td><td rowspan="2">Particles 3 e.g.</td><td rowspan="2">Machine., mg / ml</td><td rowspan="2">Dose, pg / kg</td><td colspan="2">Artery</td><td colspan="2">Vena</td>

<td>Pikas, DU</td><td>Duration , s</td><td>Pikas, DU</td><td>Duration , s</td>

<td>a</td><td>b</td><td> 4.8</td><td> 320</td><td> 0.5</td><td></td><td></td><td></td>

<td>b (i)</td><td>c</td><td> 4.6</td><td> 307</td><td> 1.9</td><td> 6</td><td> 0.8</td><td></td>

<td>b (ii)</td><td>c</td><td> 4.6</td><td> 767</td><td> 5.6</td><td> 39</td><td> 2.8</td><td></td>

<td>c</td><td>d</td><td> 3.7</td><td> 247</td><td> 0.6</td><td></td><td></td><td></td>

<td>d (i)</td><td>i</td><td> 2.1</td><td> 139</td><td> 1.7</td><td> 5</td><td></td><td></td>

<td>d (ii)</td><td>i</td><td> 2.1</td><td> 347</td><td> 3.2</td><td> 13</td><td> 1.2</td><td> 70</td>

<td>d (iii)</td><td>i</td><td> 2.1</td><td> 693</td><td> 3.1</td><td> 10</td><td> 2.1</td><td> 120</td>

<td>e (i)</td><td>h</td><td> 2.0</td><td> 136</td><td> 0.5</td><td></td><td></td><td></td>

<td>e (ii)</td><td>h</td><td> 2.0</td><td> 340</td><td> 1.0</td><td> 5</td><td></td><td></td>

<td>e (iii)</td><td>h</td><td> 2.0</td><td> 680</td><td> 1.4</td><td> 5</td><td> 0.7</td><td></td>

<td rowspan="2">Example 5</td><td rowspan="2">Pellets 3 e.g.</td><td rowspan="2">Machine., mg / ml</td><td rowspan="2">Dose, pg / kg</td><td colspan="2">Artery a</td><td colspan="2">Vena</td>

<td>Pikas, DU</td><td>Duration , s</td><td>Pikas, DU</td><td>Duration , s</td>

<td>f (i)</td><td>y</td><td> 2.1</td><td> 140</td><td> 2.8</td><td> 8</td><td> 0.5</td><td></td>

<td>f (ii)</td><td>y</td><td> 2.1</td><td> 350</td><td> 3.7</td><td> 11</td><td> 0.8</td><td> 44</td>

<td>f (iii)</td><td>y.</td><td> 2.1</td><td> 700</td><td> 5.3</td><td> 33</td><td> 0.8</td><td> 74</td>

<td>g (i)</td><td>z</td><td> 2.0</td><td> 133</td><td> 1.6</td><td> 7</td><td> 0</td><td></td>

<td>g (ii)</td><td>z</td><td> 2.0</td><td> 333</td><td> 3.6</td><td> 32</td><td> 0.7</td><td> 74</td>

<td>g (iii)</td><td>z</td><td> 2.0</td><td> 666</td><td> 5.3</td><td> 79</td><td> 1.6</td><td> 99</td>

EXAMPLE Biodegradation studies

a) Enzyme-catalyzed hydrolysis of a polymer from methacryloyl oxymethyl benzoate 5 mg of polymer (Ex. 2r) samples as a finely divided powder and 20 ml of 0.9% aqueous NaCl were added to each of three reaction vials. 0.1 ml of porcine liver 3.2 M (NH 4) esterase was also added to one vial₄)₂SO₄ (Sigma E-3128, 25OU).

To another vial was added 0.1 mL of 3.2 M (NH₄)₂SO₄. Using pH-stat (Radiometer), the pH in each of the vials was kept constant at about 8 by adding

0.1 M NaOH. Hydrolysis rates were calculated for NaOH consumption. Within 45 hours at 37 ° C, it was found that the hydrolysis of the polymer with esterase was 11 times faster than that of the₄)₂SO₄ without esterase. In a sample containing the polymer

In 0.9% NaCl solution, no hydrolysis was found (see Figure 10).

Table

Consumption of 0.1 M NaOH in a vial containing polymer and esterase with 0.1 mL of 3.2 M (NH₄)₂SO₄ 20 ml 0.9%

Of NaCl solution

<td>Time, min.</td><td>pH</td><td>Volume of 0.1 M NaOH added</td>

<td> 0</td><td> 8.00</td><td> 0.000</td>

<td> 100</td><td> 8.00</td><td> 0.080</td>

<td> 220</td><td> 8.00</td><td> 0.142</td>

<td> 355</td><td> 8.00</td><td> 0.239</td>

<td> 2670</td><td> 8.00</td><td> 1.101</td>

<td> 2710</td><td> 8.00</td><td> 1.105</td>

Table

Consumption of 0.1 M NaOH in a vial containing 0.1 ml

3.2 M (NH₄)₂SO₄ In 20 ml of 0.9% NaCl solution

<td>Time, min.</td><td>pH</td><td>Volume of 0.1 M NaOH added, ml</td>

<td> 0</td><td> 8.00</td><td> 0.000</td>

<td> 120</td><td> 8.00</td><td> 0.012</td>

<td> 240</td><td> 8.00</td><td> 0.030</td>

<td> 4316</td><td> 8.00</td><td> 0.130</td>

Table

Consumption of 0.1 M NaOH in 20 ml 0.9% NaCl vial containing polymer

<td>Time, min.</td><td>PH</td><td>Volume of 0.1 M NaOH added, ml</td>

<td> 0</td><td> 8.4</td><td> 0</td>

<td> 115</td><td> 8.0</td><td> 0.002</td>

<td> 250</td><td> 8.0</td><td> 0.002</td>

<td> 300</td><td> 8.0</td><td> 0.002</td>

<td> 1600</td><td> 8.0</td><td> 0.002</td>

b) Enzyme-catalyzed hydrolysis of a polymer from methylene bis (16-hydroxyhexadecanoate) and adipoyl chloride in mg of polymer (Example 2b) samples as a finely divided powder and 20 mL of 0.9% aqueous NaCl was added to each of the three reaction vials. 1 ml of 0.1 M esterase from pig liver 3.2 M (NH 4) was also added to one vial₄)₂SO₄ (Sigma E-3128, 25OU). To another vial was added 0.1 mL of 3.2 M (NH₄)₂SO₄. Using pH-stat (Radiometer), the pH in each of the vials was maintained constant at about 8 by the addition of 0.1 M NaOH. Hydrolysis rates were calculated for NaOH consumption. Within 44 hours at 37 ° C, it was found that the hydrolysis of the polymer with esterase was 10 times faster than that of the₄)₂SO₄ without esterase. No hydrolysis was observed in the sample containing the polymer in 0.9% NaCl solution (see Figure 11).

Table

Consumption of 0.1 M NaOH in a vial containing polymer and esterase with 0.1 mL of 3.2 M (NH₄)₂SO₄ In 20 ml of 0.9% NaCl solution

<td>Time, min.</td><td>pH</td><td>Volume of 0.1 M NaOH added, ml</td>

<td> 0</td><td> 8.00</td><td> 0.000</td>

<td> 135</td><td> 8.00</td><td> 0.058</td>

<td> 255</td><td> 8.00</td><td> 0.134</td>

<td> 1240</td><td> 8.00</td><td> 0.431</td>

<td> 1705</td><td> 8.00</td><td> 0.602</td>

<td> 2635</td><td> 8.00</td><td> 1.026</td>

<td> 2665</td><td> 8.00</td><td> , 1.034</td>

Table

Consumption of 0.1 M NaOH in a vial containing 0.1 mL of 3.2 M (NH₄)₂SO₄ In 20 ml of 0.9% NaCl solution

<td>Time, min.</td><td>PH</td><td>Volume of 0.1 M NaOH added, ml</td>

<td> 0</td><td> 8.00</td><td> 0.000</td>

<td> 120</td><td> 8.00</td><td> 0.012</td>

<td> 240</td><td> 8.00</td><td> 0.030</td>

<td> 4316</td><td> 8.00</td><td> 0.130</td>

Table

Consumption of 0.1 M NaOH in a vial containing polymer 10 in 20 ml of 0.9% NaCl solution

<td>Time, min.</td><td>PH</td><td>Volume of 0.1 M NaOH added, ml</td>

<td> 0</td><td> 8.4</td><td> 0.002</td>

<td> 50</td><td> 7.9</td><td> 0.002</td>

<td> 145</td><td> 7.9</td><td> 0.002</td>

<td> 235</td><td> 7.9</td><td> 0.002</td>

LITERATURE

l.Folkman M., Lund FJ, Synthesis 1990, p. 1159.

<td></td><td>2.Benneche</td><td>T.,</td><td>Strande P.,</td><td>Wiggen U., Act. Chem. Scand.</td>

<td></td><td> 43, 1988,</td><td>P ·</td><td> 74.</td><td></td>

<td> 20</td><td>3.Stroholm</td><td>J. r</td><td>Kopecek J.,</td><td>Angew. Macromol. Chemie 70,</td>

<td></td><td>1978, p.</td><td> 109</td><td></td><td></td>