5-Dichloroacetamido-4-nitro-1-aryl-pyrazoles.
Abstract
The invention relates to new 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles of the formula (I), in which R¹ represents hydrogen, fluorine, chlorine or bromine, R² represents hydrogen, fluorine or chlorine, R³ represents halogen, haloalkyl, haloalkoxy, haloalkylthio or haloalkylsulfonyl, R⁴ represents hydrogen, fluorine or chlorine and R⁵ represents fluorine, chlorine or bromine, being however in the event that R¹ and R⁵ simultaneously represent chlorine and additionally R² and R⁴ simultaneously represent hydrogen, R³ does not represent chlorine or trifluoromethyl, several processes for their preparation, their use as herbicides and growth regulators and new intermediates for their production.

Term
Term ended
Projected expiry passed 24 November 2006, 19.8 years ago.
- Priority
- Filed
- Published
- Projected expiry
- Today
10 claims: 10 independent, 0 dependent
- 15-dichloroacetamido-4-nitro-1-aryl-pyrazoles of the general formula (I), in which R¹ represents hydrogen, fluorine, chlorine or bromine, R² represents hydrogen, fluorine or chlorine, R³ represents halogen, haloalkyl, haloalkoxy, haloalkylthio or haloalkylsulfonyl, R⁴ represents hydrogen, fluorine or chlorine and R⁵ represents fluorine, chlorine or bromine, being however in the event that R¹ and R⁵ simultaneously represent chlorine and additionally R² and R⁴ simultaneously represent hydrogen, R³ does not represent chlorine or trifluoromethyl. 1. 5-Dichloracetamido-4-nitro-1-aryl-pyrazole der allgemeinen Formel (I), in welcher R¹ für Wasserstoff, Fluor, Chlor oder Brom steht, R² für Wasserstoff, Fluor oder Chlor steht, R³ für Halogen, Halogenalkyl, Halogenalkoxy, Halogenalkylthio oder Halogenalkylsulfonyl steht, R⁴ für Wasserstoff, Fluor oder Chlor steht und R⁵ für Fluor, Chlor oder Brom steht, wobei jedoch für den Fall, daß R¹ und R⁵ gleichzeitig für Chlor stehen und zusätzlich R² und R⁴ gleichzeitig für Wasserstoff stehen, R³ nicht für Chlor oder für Trifluormethyl steht.
- 25-Dichloracetamido-4-nitro-1-aryl-pyrazole der Formel (I) gemäß Anspruch 1, in welcher R¹ für Wasserstoff, Fluor, Chlor oder Brom steht, R² für Wasserstoff, Fluor oder Chlor steht, R³ für Fluor, Chlor, Brom oder für jeweils geradkettiges oder verzweigtes Halogenalkyl, Halogenalkoxy, Halogenalkylthio oder Halogenalkylsulfonyl mit jeweils 1 bis 4 Kohlenstoffatomen und 1 bis 9 gleichen oder verschiedenen Halogenatomen steht, R⁴ für Wasserstoff, Fluor oder Chlor steht und R⁵ für Fluor, Chlor oder Brom steht, wobei jedoch für den Fall, daß R¹ und R⁵ gleichzeitig für Chlor stehen und zusätzlich R² und R⁴ gleichzeitig für Wasserstoff stehen, R³ nicht für Chlor oder für Trifluormethyl steht. 2nd 5-dichloroacetamido-4-nitro-1-aryl-pyrazole of the formula (I) according to Claim 1, in which R¹ represents hydrogen, fluorine, chlorine or bromine, R² represents hydrogen, fluorine or chlorine, R³ represents fluorine, chlorine, bromine or each straight-chain or branched haloalkyl, haloalkoxy, haloalkylthio or haloalkylsulfonyl each having 1 to 4 carbon atoms and 1 to 9 identical or different halogen atoms, R⁴ represents hydrogen, fluorine or chlorine and R⁵ for fluorine, Chlorine or bromine, being however in the event that R¹ and R⁵ simultaneously represent chlorine and additionally R² and R⁴ simultaneously represent hydrogen, R³ does not represent chlorine or trifluoromethyl.
- 3Verfahren zur Herstellung von 5-Dichloracetamido-4-nitro-1-aryl-pyrazolen der Formel (I), in welcher R¹ für Wasserstoff, Fluor, Chlor oder Brom steht, R² für Wasserstoff, Fluor oder Chlor steht, R³ für Halogen, Halogenalkyl, Halogenalkoxy, Halogenalkylthio oder Halogenalkylsulfonyl steht, R⁴ für Wasserstoff, Fluor oder Chlor steht und R⁵ für Fluor, Chlor oder Brom steht, wobei jedoch für den Fall, daß R¹ und R⁵ gleichzeitig für Chlor stehen und zusätzlich R² und R⁴ gleichzeitig für Wasserstoff stehen, R³ nicht für Chlor oder für Trifluormethyl steht, dadurch gekennzeichnet, daß man a) 5-Amino-4-nitro-1-aryl-pyrazole der Formel (II), in welcher R¹, R², R³, R⁴ und R⁵ die oben angegebene Bedeutung haben, mit Dichloracetylverbindungen der Formel (III), Cl₂CH - - E (III) in welcher E für eine elektronenanziehende Abgangsgruppe steht, gegebenenfalls in Gegenwart eines Verdünnungsmittels und gegebenenfalls in Gegenwart eines sauren oder basischen Katalysators umsetzt, oder daß manb) in 4-Stellung unsubstituierte 5-Dichloracetamido-1-aryl-pyrazole der Formel (IV), in welcher R¹, R², R³, R⁴ und R⁵ die oben angegebene Bedeutung haben, mit Salpetersäure gegebenenfalls in Gegenwart eines Verdünnungsmittels und gegebenenfalls in Gegenwart eines Katalysators umsetzt. 3rd Process for the preparation of 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles of the formula (I), in which R¹ represents hydrogen, fluorine, chlorine or bromine, R² represents hydrogen, fluorine or chlorine, R³ represents halogen, haloalkyl, haloalkoxy, haloalkylthio or haloalkylsulfonyl, R⁴ represents hydrogen, fluorine or chlorine and R⁵ represents fluorine, chlorine or bromine, being however in the event that R¹ and R⁵ simultaneously represent chlorine and additionally R² and R⁴ simultaneously represent hydrogen, R³ does not represent chlorine or trifluoromethyl, characterized, that hea) 5-amino-4-nitro-1-aryl-pyrazoles of the formula (II), in which R¹, R², R³, R⁴ and R⁵ have the meaning given above, with dichloroacetyl compounds of the formula (III), Cl₂CH - - E (III) in which E stands for an electron-withdrawing leaving group, if appropriate in the presence of a diluent and if appropriate in the presence of an acidic or basic catalyst, or that heb) 5-dichloroacetamido-1-aryl-pyrazoles of the formula (IV) which are unsubstituted in the 4-position, in which R¹, R², R³, R⁴ and R⁵ have the meaning given above, with nitric acid if appropriate in the presence of a diluent and if appropriate in the presence of a catalyst.
- 4Herbizide und pflanzenwuchsregulierende Mittel, gekennzeichnet durch einen Gehalt an mindestens einem 5-Dichloracetamido-4-nitro-1-aryl-pyrazol der Formel (I) gemäß den Ansprüchen 1 bis 3. 4th Herbicides and plant growth regulators, characterized in that they contain at least one 5-dichloroacetamido-4-nitro-1-aryl-pyrazole of the formula (I) according to Claims 1 to 3.
- 5Use of 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles of the formula (I) according to Claims 1 to 3, for combating weeds and / or as plant growth regulators. 5. Verwendung von 5-Dichloracetamido-4-nitro-1-aryl-pyrazolen der Formel (I) gemäß den Ansprüchen 1 bis 3, zur Bekämpfung von Unkräutern und/oder als Pflanzenwachstumsregulatoren.
- 6Process for the preparation of herbicidal and / or plant growth-regulating agents, characterized in that 5-dichloroacetamido-4-nitro-1-aryl-pyrazole of the formula (I) according to Claims 1 to 3 is mixed with extenders and / or surface-active substances. 6. Verfahren zur Herstellung von herbiziden und/oder pflanzenwuchsregulierenden Mitteln, dadurch gekennzeichnet, daß man 5-Dichloracetamido-4-nitro-1-aryl-pyrazole der Formel (I) gemäß den Ansprüchen 1 bis 3 mit Streckmitteln und/oder oberflächenaktiven Substanzen vermischt.
- 75-amino-4-nitropyrazoles of the formula (IIa), in which R¹⁻¹, R²⁻¹ and R⁴⁻¹ each independently represent hydrogen, fluorine or chlorine and R⁵⁻¹ represents fluorine or chlorine, however, the combinations in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously fluorine, R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously chlorine, R¹⁻¹ and R⁵⁻¹ are chlorine and R²⁻¹ and R⁴⁻¹ are either simultaneously hydrogen or fluorine, and R¹⁻¹, R²⁻¹ and R⁴⁻¹ are hydrogen and R⁵⁻¹ are simultaneously chlorine and R¹⁻¹, R²⁻¹ and R⁵⁻¹ are chlorine and R⁴⁻¹ are simultaneously hydrogen, except. 7. 5-Amino-4-nitropyrazole der Formel (IIa), in welcher R¹⁻¹, R²⁻¹ und R⁴⁻¹ jeweils unabhängig voneinander für Wasserstoff, Fluor oder Chlor stehen und R⁵⁻¹ für Fluor oder Chlor steht, wobei jedoch die Kombinationen, in denen R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ gleichzeitig für Fluor stehen, R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ gleichzeitig für Chlor stehen, R¹⁻¹ und R⁵⁻¹ für Chlor und R²⁻¹und R⁴⁻¹ entweder gleichzeitig für Wasserstoff oder Fluor stehen, sowie R¹⁻¹, R²⁻¹ und R⁴⁻¹ für Wasserstoff und R⁵⁻¹ gleichzeitig für Chlor stehen und R¹⁻¹, R²⁻¹ und R⁵⁻¹ für Chlor und R⁴⁻¹ gleichzeitig für Wasserstoff stehen, ausgenommen sind.
- 8Verfahren zur Herstellung von 5-Amino-4-nitro-pyrazolen der Formel (IIa), in welcher R¹⁻¹, R²⁻¹ und R⁴⁻¹ jeweils unabhängig voneinander für Wasserstoff, Fluor oder Chlor stehen und R⁵⁻¹ für Fluor oder Chlor steht, wobei jedoch die Kombinationen in denen R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ gleichzeitig für Fluor stehen, R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ gleichzeitig für Chlor stehen, R¹⁻¹ und R⁵⁻¹ für Chlor und R²⁻¹und R⁴⁻¹ entweder gleichzeitig für Wasserstoff oder Fluor stehen, sowie R¹⁻¹, R²⁻¹ und R⁴⁻¹ für Wasserstoff und R⁵⁻¹ gleichzeitig für Chlor stehen und R¹⁻¹, R²⁻¹ und R⁵⁻¹ für Chlor und R⁴⁻¹ gleichzeitig für Wasserstoff stehen, ausgenommen sind, dadurch gekennzeichnet, daß man Phenylhydrazine der Formel (V), in welcher R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ die oben angegebene Bedeutung haben, mit 2-Halogenacrylnitrilen der Formel (VI), in welcher Hal für Halogen, insbesondere für Chlor oder Brom steht, zunächst in einer 1. Stufe, gegebenenfalls in Gegenwart eines Verdünnungsmittels, sowie gegebenenfalls in Gegenwart eines Reaktionshilfsmittels bei Temperaturen zwischen -20 °C und +20 °C umsetzt zu den Arylhydrazin-Derivaten der Formel (VII), in welcher R¹⁻¹, R²⁻¹, R⁴⁻¹, R⁵⁻¹ und Hal die oben angegebene Bedeutung haben, und diese in einer 2. Stufe, gegebenenfalls in Gegenwart eines Verdünnungsmittels und gegebenenfalls in Gegenwart eines sauren Katalysators bei Temperaturen zwischen +50 °C und +150 °C cyclisiert, und die so erhältlichen in 4-Stellung unsubstituierten 5-Amino-pyrazole der Formel (VIII), in welcher R¹⁻¹, R²⁻¹, R⁴⁻¹, R⁵⁻¹ die oben angegebene Bedeutung haben, in einer Folgereaktion mit einem Nitrierungsmittel gegebenenfalls in Gegenwart eines Verdünnungsmittels und gegebenenfalls in Gegenwart eines Reaktionshilfsmittels bei Temperaturen zwischen -20°C und +50°C nitriert. 8th. Process for the preparation of 5-amino-4-nitro-pyrazoles of the formula (IIa), in which R¹⁻¹, R²⁻¹ and R⁴⁻¹ each independently represent hydrogen, fluorine or chlorine and R⁵⁻¹ represents fluorine or chlorine, however the combinations in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously fluorine, R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously chlorine, R¹⁻¹ and R⁵⁻¹ are chlorine and R²⁻¹ and R⁴⁻¹ are either simultaneously hydrogen or fluorine, and R¹⁻¹, R²⁻¹ and R⁴⁻¹ are hydrogen and R⁵⁻¹ are simultaneously chlorine and R¹⁻¹, R²⁻¹ and R⁵⁻¹ are chlorine and R⁴⁻¹ are simultaneously hydrogen, except that characterized in that phenylhydrazines of the formula (V), in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ have the meaning given above, with 2-haloacrylonitriles of the formula (VI), in which Hal represents halogen, in particular chlorine or bromine, first in a first stage, if appropriate in the presence of a diluent, and if appropriate in the presence of a reaction auxiliary at temperatures between -20 ° C. and +20 ° C., to give the arylhydrazine derivatives of the formula (VII), in which R¹⁻¹, R²⁻¹, R⁴⁻¹, R⁵⁻¹ and Hal have the meaning given above, and cyclizing them in a second stage, optionally in the presence of a diluent and optionally in the presence of an acidic catalyst at temperatures between +50 ° C and +150 ° C, and the 5-amino-pyrazoles of the formula (VIII) which are thus unsubstituted in the 4-position, in which R¹⁻¹, R²⁻¹, R⁴⁻¹, R⁵⁻¹ have the meaning given above, nitrated in a subsequent reaction with a nitrating agent, if appropriate in the presence of a diluent and if appropriate in the presence of a reaction auxiliary, at temperatures between -20 ° C. and + 50 ° C.
- 9Arylhydrazines of the formula (V), in which R¹⁻¹, R²⁻¹ and R⁴⁻¹ each independently represent hydrogen, fluorine or chlorine and R⁵⁻¹ represents fluorine or chlorine, however, the combination in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously fluorine, R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously chlorine, R¹⁻¹ and R⁵⁻¹ are chlorine and R²⁻¹ and R⁴⁻¹ are either simultaneously hydrogen or fluorine, and R¹⁻¹, R²⁻¹ and R⁴⁻¹ are hydrogen and R⁵⁻¹ are simultaneously chlorine and R¹⁻¹, R²⁻¹ and R⁵⁻¹ are chlorine and R⁴⁻¹ are simultaneously hydrogen, except. 9. Arylhydrazine der Formel (V), in welcher R¹⁻¹, R²⁻¹ und R⁴⁻¹ jeweils unabhängig voneinander für Wasserstoff, Fluor oder Chlor stehen und R⁵⁻¹ für Fluor oder Chlor steht, wobei jedoch die Kombination, in denen R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ gleichzeitig für Fluor stehen, R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ gleichzeitig für Chlor stehen, R¹⁻¹ und R⁵⁻¹ für Chlor und R²⁻¹und R⁴⁻¹ entweder gleichzeitig für Wasserstoff oder Fluor stehen, sowie R¹⁻¹, R²⁻¹ und R⁴⁻¹ für Wasserstoff und R⁵⁻¹ gleichzeitig für Chlor stehen und R¹⁻¹, R²⁻¹ und R⁵⁻¹ für Chlor und R⁴⁻¹ gleichzeitig für Wasserstoff stehen, ausgenommen sind.
- 10Verfahren zur Herstellung von Arylhydrazinen der Formel (V), in welcher R¹⁻¹, R²⁻¹ und R⁴⁻¹ jeweils unabhängig voneinander für Wasserstoff, Fluor oder Chlor stehen, und R⁵⁻¹ für Fluor oder Chlor steht, wobei jedoch die Kombinationen, in denen R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ gleichzeitig für Fluor stehen, R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ gleichzeitig für Chlor stehen, R¹⁻¹ und R⁵⁻¹ für Chlor und R²⁻¹und R⁴⁻¹ entweder gleichzeitig für Wasserstoff oder Fluor stehen, sowie R¹⁻¹, R²⁻¹ und R⁴⁻¹ für Wasserstoff und R⁵⁻¹ gleichzeitig für Chlor stehen und R¹⁻¹, R²⁻¹ und R⁵⁻¹ für Chlor und R⁴⁻¹ gleichzeitig für Wasserstoff stehen, ausgenommen sind, und dadurch gekennzeichnet, daß man Halogenaromaten der Formel (IX) in welcher R¹⁻¹, R²⁻¹, R⁴⁻¹ und R⁵⁻¹ die oben angegebene Bedeutung haben, Hal¹ für Halogen, insbesondere für Fluor oder Chlor steht, mit Hydrazin oder Hydrazinhydrat gegebenenfalls in Gegenwart eines Verdünnungsmittels umsetzt. 10th Process for the preparation of arylhydrazines of the formula (V), in which R¹⁻¹, R²⁻¹ and R⁴⁻¹ each independently represent hydrogen, fluorine or chlorine, and R⁵⁻¹ represents fluorine or chlorine, however, the combinations in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously fluorine, R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously chlorine, R¹⁻¹ and R⁵⁻¹ are chlorine and R²⁻¹ and R⁴⁻¹ are either simultaneously hydrogen or fluorine, and R¹⁻¹, R²⁻¹ and R⁴⁻¹ are hydrogen and R⁵⁻¹ are simultaneously chlorine and R¹⁻¹, R²⁻¹ and R⁵⁻¹ are chlorine and R⁴⁻¹ are simultaneously hydrogen, except for, and characterized in that halogen aromatics of the formula (IX) in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ have the meaning given above, Hal¹ represents halogen, in particular fluorine or chlorine, with hydrazine or hydrazine hydrate, optionally in the presence of a diluent.
Independent claims10
134 paragraphs, as filed
The invention relates to new 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles, several processes for their preparation, their use as herbicides and growth regulators and new intermediates for their preparation.
It is already known that certain 5-haloacylamino-4-nitro-1-aryl-pyrazoles, such as 5- (ω-chlorobutyramido) -4-nitro-1- (2,6-dichloro-4-trifluoromethylphenyl) - pyrazole herbicidal properties (vg. DE-OS 3 402 308).
However, the herbicidal activity of these previously known compounds against problem weeds, just like their tolerance to important useful plants, is not always completely satisfactory in all areas of application.
There were new 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles of the general formula (I),<chemistry id="chem0001" num="0001"><img file="EP0224831A2_D0001.tif" /></chemistry> in which R¹ represents hydrogen, fluorine, chlorine or bromine, R² represents hydrogen, fluorine or chlorine, R³ represents halogen, haloalkyl, haloalkoxy, haloalkylthio or haloalkylsulfonyl, R⁴ represents hydrogen, fluorine or chlorine and R⁵ represents fluorine, chlorine or bromine, being however in the event that R¹ and R⁵ simultaneously represent chlorine and additionally R² and R⁴ simultaneously represent hydrogen, R³ does not represent chlorine or trifluoromethyl, found.
It was also found that the new 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles of the general formula (I)<chemistry id="chem0002" num="0002"><img file="EP0224831A2_D0002.tif" /></chemistry> in which R¹ represents hydrogen, fluorine, chlorine or bromine, R² represents hydrogen, fluorine or chlorine, R³ represents halogen, haloalkyl, haloalkoxy, haloalkylthio or haloalkylsulfonyl, R⁴ represents hydrogen, fluorine or chlorine and R⁵ represents fluorine, chlorine or bromine, being however in the event that R¹ and R⁵ simultaneously represent chlorine and additionally R² and R⁴ simultaneously represent hydrogen, R³ does not represent chlorine or trifluoromethyl, get when one<ul id="ul0001" list-style="none"><li>a) 5-amino-4-nitro-1-aryl-pyrazoles of the formula (II),<chemistry id="chem0003" num="0003"><img file="EP0224831A2_D0003.tif" /></chemistry> in which R¹, R², R³, R⁴ and R⁵ have the meaning given above with dichloroacetyl compounds of the formula (III), Cl₂CH - <img file="EP0224831A2_D0004.tif" /> - E (III) in which E stands for an electron-withdrawing leaving group, if appropriate in the presence of a diluent and if appropriate in the presence of an acidic or basic catalyst, or if</li><li>b) 5-dichloroacetamido-1-aryl-pyrazoles of the formula (IV) which are unsubstituted in the 4-position,<chemistry id="chem0004" num="0004"><img file="EP0224831A2_D0005.tif" /></chemistry> in which R¹, R², R³, R⁴ and R⁵ have the meaning given above, with nitric acid if appropriate in the presence of a diluent and if appropriate in the presence of a catalyst.</li></ul>
Finally, it was found that the new 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles of the formula (I) have herbicidal and growth-regulating effects.
Surprisingly, the 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles of the general formula (I) according to the invention show a considerably better herbicidal activity against problem weeds with a comparably good crop selectivity than the 5-haloacylamido-4- known from the prior art. nitro-1-aryl-pyrazoles, such as, for example, 5- (ω-chlorobutyramido) -4-nitro-1- (2,6-dichloro-4-trifluoromethyl-phenyl) pyrazole, which are chemically and functionally obvious compounds.
The 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles according to the invention are generally defined by the formula (I). Compounds of the formula (I) are preferred in which R¹ represents hydrogen, fluorine, chlorine or bromine, R² represents hydrogen, fluorine or chlorine, R³ represents fluorine, chlorine, bromine or each straight-chain or branched haloalkyl, haloalkoxy, haloalkylthio or haloalkylsulfonyl each having 1 to 4 carbon atoms and 1 to 9 identical or different halogen atoms (in particular fluorine, chlorine or bromine), R⁴ represents hydrogen, fluorine or chlorine and R⁵ for fluorine, Chlorine or bromine, being however in the event that R¹ and R⁵ simultaneously represent chlorine and additionally R² and R⁴ simultaneously represent hydrogen, R³ does not represent chlorine or trifluoromethyl.
Compounds of the formula (I) are particularly preferred in which R¹ represents hydrogen, fluorine, chlorine or bromine, R² represents hydrogen, fluorine or chlorine, R³ is fluorine, chlorine, bromine, trifluoromethyl, difluoromethyl, fluoromethyl, trichloromethyl, dichlorofluoromethyl, difluorochloromethyl, pentafluoroethyl, trifluoromethoxy, trichloromethoxy, trifluoromethylthio, trifluoromethylsulfonyl, difluorochloromethylsulfonyl, dichloromethylsulfonyl, dichloromethylsulfonyl, R⁴ for hydrogen, Fluorine or chlorine stands and R⁵ represents fluorine, chlorine or bromine, being however in the event that R¹ and R⁵ simultaneously represent chlorine and additionally R² and R⁴ simultaneously represent hydrogen, R³ does not represent chlorine or trifluoromethyl.
In particular, reference is made to the compounds of the formula (I) mentioned in the preparation examples.
If, for example, 5-amino-4-nitro-1- (2,3,6-trichloro-4-trifluoromethyl-phenyl) pyrazole and dichloroacetic anhydride are used as starting materials, the course of the reaction of process (a) according to the invention can be determined by the following formula represent:<chemistry id="chem0005" num="0005"><img file="EP0224831A2_D0006.tif" /></chemistry>
If, for example, 5-dichloroacetamido-1- (2,6-dichloro-4-trifluoromethylsulfonylphenyl) pyrazole is used as the starting compound, the course of the reaction of process (b) according to the invention can be represented by the following formula:<chemistry id="chem0006" num="0006"><img file="EP0224831A2_D0007.tif" /></chemistry>
Formula (II) generally defines the 5-amino-4-nitro-pyrazoles required as starting materials for carrying out process (a) according to the invention. In this formula (II) R¹, R², R³, R⁴ and R⁵ are preferably those radicals which have already been mentioned as preferred for these substituents in connection with the description of the substances of the formula (I) according to the invention.
Some of the 5-amino-4-nitro-pyrazoles of formula (II) are known (cf. DE-OS 3 402 308) and can be prepared by the processes described there.
The 5-amino-4-nitropyrazoles of the formula (IIa) are not yet known,<chemistry id="chem0007" num="0007"><img file="EP0224831A2_D0008.tif" /></chemistry> in which R¹⁻¹, R²⁻¹ and R⁴⁻¹ each independently represent hydrogen, fluorine or chlorine and R⁵⁻¹ represents fluorine or chlorine, however the combinations in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously fluorine, R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously chlorine, R¹⁻¹ and R⁵⁻¹ are chlorine and R²⁻¹ and R⁴⁻¹ are either simultaneously hydrogen or fluorine, and R¹⁻¹, R²⁻¹ and R⁴⁻¹ are hydrogen and R⁵⁻¹ are both chlorine and R¹⁻¹, R²⁻¹ and R⁵⁻¹ are chlorine and R⁴⁻¹ are simultaneously hydrogen, except.
Preferred compounds of the formula (IIa) are those in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ have the preferred meaning given in the description of the phenylhydrazines of the formula (V).
The compounds of formula (IIa) can be prepared by using arylhydrazines of formula (V)<chemistry id="chem0008" num="0008"><img file="EP0224831A2_D0009.tif" /></chemistry> in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ have the meaning given above, with 2-haloacrylonitriles of the formula (VI),<chemistry id="chem0009" num="0009"><img file="EP0224831A2_D0010.tif" /></chemistry> in which Hal represents halogen, in particular chlorine or bromine, either first in a 1st stage, optionally in the presence of a diluent, such as glacial acetic acid or ethanol, and optionally in the presence of a reaction auxiliary such as sodium acetate at temperatures between -20 ° C and +20 ° C to the arylhydrazine derivatives of the formula (VII ),<chemistry id="chem0010" num="0010"><img file="EP0224831A2_D0011.tif" /></chemistry> in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ and Hal have the meaning given above, and this in a 2nd Stage, optionally cyclized in the presence of a diluent such as, for example, ethylene glycol monoethyl ether and optionally in the presence of an acidic catalyst such as, for example, sulfuric acid or phosphoric acid at temperatures between +50 ° C and +150 ° C, or cyclized directly in a reaction step without isolation of the intermediate of formula (VII), if appropriate in the presence of a diluent such as, for example, ethylene glycol monoethyl ether or ethanol at temperatures between +50 ° C. and +150 ° C., and the 4-position-unsubstituted 5-amino pyrazoles of the formula (VIII),<chemistry id="chem0011" num="0011"><img file="EP0224831A2_D0012.tif" /></chemistry> in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ have the meaning given above, in a subsequent reaction with a nitrating agent such as nitric acid, optionally in the presence of a diluent such as glacial acetic acid and optionally in the presence of a reaction auxiliary such as acetic anhydride at temperatures between -20 ° C and +50 ° C.
It may be advantageous here to protect the amino group in the 5-position of the pyrazole ring with the aid of customary protective group technology, for example by acylation, and the amino protective group after nitriding, likewise in the customary manner, for example by saponification with aqueous or alcoholic base, before the nitration reaction split off again.
In corresponding concentrations, the new 5-amino-4-nitropyrazoles of the formula (II-a) also show very good herbicidal, in particular selective herbicidal activity.
The arylhydrazines of the formula (V),<chemistry id="chem0012" num="0012"><img file="EP0224831A2_D0013.tif" /></chemistry> in which R¹⁻¹, R²⁻¹ and R⁴⁻¹ each independently represent hydrogen, fluorine or chlorine and R⁵⁻¹ represents fluorine or chlorine, however, the combinations in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously fluorine, R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ are simultaneously chlorine, R¹⁻¹ and R⁵⁻¹ are chlorine and R²⁻¹ and R⁴⁻¹ are either hydrogen or fluorine, and R¹ sowie¹, R²⁻¹ and R⁴⁻¹ are hydrogen and R⁵⁻¹ are both chlorine and R¹⁻¹, R²⁻¹ and R⁵⁻¹ are chlorine and R⁴⁻¹ are simultaneously hydrogen, except that are new and the subject of the present invention.
The following compounds of formula (V) are preferred:<tables id="tabl0001" num="0001"><img file="EP0224831A2_D0014.tif" /></tables>
For example, the new arylhydrazines of the formula (V) are obtained if halogenoaromatics of the formula (IX)<chemistry id="chem0013" num="0013"><img file="EP0224831A2_D0015.tif" /></chemistry> in which R¹⁻¹, R²⁻¹, R⁴⁻¹ and R⁵⁻¹ have the meaning given above and Hal¹ represents halogen, in particular fluorine or chlorine, with hydrazine or hydrazine hydrate, optionally in the presence of a diluent.
The 2-haloacrylonitriles of the formula (VI) and the halogenoaromatics of the formula (IX) are generally known compounds of organic chemistry (cf., for example, EP-A-34 402 and US Pat. No. 4,388,472).
The reaction according to the invention for the preparation of the arylhydrazines of the formula (V) is generally carried out in the presence of a solvent. Suitable solvents are, for example, alcohols, ethers, ether alcohols, tertiary amines and sulfones. Ethanol, dioxane, glycol monomethyl ether, triethylamine, pyridine, picoline and tetramethylene sulfone are particularly suitable.
Suitable temperatures for this reaction are, for example, those in the range from 0 to 120 ° C., with temperatures in the range from 50 to 120 ° C. preferably being used in particular when using less reactive compounds of the formula (IX). The application of pressure is generally not necessary unless the reaction is to be carried out in a solvent which has a boiling point at normal pressure which is below the desired reaction temperature.
In general, it is advantageous if only small excesses of hydrazine are present during the reaction. The compound of the formula (IX) is therefore preferably initially introduced, optionally together with solvent, and hydrazine is then added. It is also generally advantageous to avoid the use of larger excesses of hydrazine, for example more than 1.2 moles of hydrazine per mole of the compound of the formula (IX).
If a compound of formula (IX) with Hal 1 = chlorine is used, it is very advantageous to add a base, unless a base, for example pyridine, is already used as the solvent. Suitable bases are, for example, tertiary amines, such as triethylamine, pyridine and picoline, and carbonates, hydrogen carbonates and acetates of alkali metals, such as potassium acetate, sodium acetate, potassium carbonate, sodium hydrogen carbonate, sodium carbonate, calcium hydroxide and calcium. If appropriate, hydrazine can also serve as this base.
The hydrazine can be used, for example, in the form of hydrazine hydrate, but also in anhydrous form or hydrazine containing up to 80% by weight of water.
The reaction is generally complete after 1 to 15 hours. The reaction mixture can then be worked up, for example, by stirring the reaction mixture into cold water, the crystalline product of the formula, if appropriate after distilling off at least half, preferably at least 80% by weight of the solvent present (which can be reused) (V) separated, if necessary, washed with a little water and dried. If desired, the product can also be recrystallized, for example from cyclohexane or toluene.
The compounds of formula (V) are crystalline at room temperature and can be obtained in the described manner with good yields and in good purities. Smaller proportions of isomers, which are formed, for example, by the entry of the NH₂-NH group elsewhere than in the para position to the CF₃ group, are largely removed by the workup described.
Formula (III) provides a general definition of the dichloroacetyl compounds which are further required as starting materials for carrying out process (a) according to the invention. In this formula (III), E preferably represents halogen, in particular chlorine or bromine or a dichloroacetyloxy radical.
The dichloroacetyl compounds of the formula (III) are generally known compounds of organic chemistry.
Formula (IV) provides a general definition of the 5-dichloroacetamido-1-aryl-pyrazoles which are unsubstituted in the 4-position and are required as starting materials for carrying out process (b) according to the invention. In this formula (IV) R¹, R², R³, R⁴ and R⁵ preferably represent those radicals which have already been mentioned as preferred for these substituents in connection with the description of the substances of the formula (I) according to the invention.
The 4-position unsubstituted dichloroacetamido-1-aryl-pyrazoles of the formula (IV) are not yet known. However, they are obtained in analogy to known processes (cf., for example, DE-OS 3 402 308) if 5-amino-pyrazoles of the formula (X) which are unsubstituted in the 4-position are<chemistry id="chem0014" num="0014"><img file="EP0224831A2_D0016.tif" /></chemistry> in which R¹, R², R³, R⁴ and R⁵ have the meaning given above, with dichloroacetyl compounds of the formula (III), Cl₂CH - <img file="EP0224831A2_D0017.tif" /> - E (III) in which E has the meaning given above, optionally acylated in the presence of a diluent such as dichloromethane and optionally in the presence of an acid binder such as pyridine in analogy to carrying out process (a) according to the invention at temperatures between -20 ° C. and +120 ° C.
The 4-amino-pyrazoles of the formula (X) which are unsubstituted in the 4-position are known in some cases (see, for example, DE-OS 3 402 308) and some are new (see compounds of the general formula (VIII) and can be prepared analogously to known ones Establish process.
Inert organic solvents are suitable as diluents for carrying out process (a) according to the invention.
These include in particular aliphatic or aromatic, optionally halogenated hydrocarbons, such as, for example, gasoline, benzene, toluene, xylene, chlorobenzene, petroleum ether, hexane, cyclohexane, dichloromethane, chloroform, carbon tetrachloride, ethers, such as diethyl ether, dioxane, tetrahydrofuran or ethylene glycol dimethyl or diethyl ether, Ketones such as acetone or butanone, nitrols such as acetonitrile or propionitrile, amides such as dimethylformamide, dimethylacetamide, N-methylformanilide, N-methylpyrrolidone or hexamethylphosphoric triamide, esters such as ethyl acetate, sulfoxides such as dimethyl sulfoxide or carboxylic acids such as acetic acid.
Process (a) according to the invention is optionally carried out in the presence of a suitable acidic or basic catalyst.
All conventional inorganic or organic bases or anhydrous protonic acids are suitable as such. These include, for example, alkali metal hydroxides, such as sodium hydroxide or potassium hydroxide, alkali metal carbonates, such as sodium carbonate, potassium carbonate or sodium hydrogen carbonate, tertiary amines, such as triethylamine, N, N-dimethylaniline, pyridine, N, N-dimethylaminopyridine, diazabicyclooctane (DABCO) or diazabicyclonone, diazabicyclone, diazabicyclone (DBU) or anhydrous sulfuric acid, phosphoric acid or hydrochloric acid.
The reaction temperatures can be varied over a wide range when carrying out process (a) according to the invention. In general, temperatures between -20 ° C and +150 ° C, preferably at temperatures between 0 ° C and 120 ° C.
To carry out process (a) according to the invention, generally 1.0 to 5.0 mol, preferably 1.0 to 2.0 mol, of dichloroacetyl compound of the formula (1) are used per mol of 5-amino-4-nitro-1-aryl-pyrazole of the formula (II) III) and optionally 1.0 to 5.0 mol, preferably 1.0 to 2.0 mol, of an acid binder. The reaction, working up and isolation of the reaction products of the formula (I) is carried out by customary, generally known processes.
Suitable diluents for carrying out process (b) according to the invention are all solvents which can customarily be used for such nitration reactions. The acids which are suitable as reagents or mixtures thereof with catalyst acid, such as, for example, sulfuric acid, nitric acid, acetic anhydride or nitrating acid, are preferably used simultaneously as diluents. Inert organic solvents such as glacial acetic acid or chlorinated hydrocarbons such as methylene chloride, chloroform or carbon tetrachloride may also be used as diluents.
Suitable catalysts or reaction auxiliaries for carrying out process (b) according to the invention are also the catalysts customary for such nitrations; acidic catalysts, such as, for example, sulfuric acid or acetanhyride, are preferably used.
The reaction temperatures can be varied within a substantial range when carrying out process (b) according to the invention. In general, temperatures between -50 ° C and +120 ° C, preferably at temperatures between -20 ° C and +150 ° C.
To carry out process (b) according to the invention, in general from 1.0 to 100.0 mol, preferably 1.0 to 50.0 mol of nitric acid and optionally 0.1 to 1 to 5-dichloroacetamido-1-aryl-pyrazole of the formula (IV) are employed per mol 10 moles of catalyst. The reaction, working up and isolation of the reaction products of the formula (I) is carried out by customary, generally known processes.
The active compounds according to the invention can be used as defoliants, desiccants, haulm killers and in particular as weed killers. Weeds in the broadest sense are understood to mean all plants that grow up in places where they are undesirable. Whether the substances according to the invention act as total or selective herbicides depends essentially on the amount used.
The active compounds according to the invention can be used, for example, in the following plants:
<u style="single">Dicot weeds of the genera:</u> Sinapis, Lepidium, Galium, Stellaria, Matricaria, Anthemis, Galinsoga, Chenopodium, Urtica, Senecio, Amaranthus, Portulaca, Xanthium, Convolvulus, Ipomoea, Polygonum, Sesbania, Ambrosia, Cirsium, Carduus, Sonchus, Solanum, Rorippernia, Rorippa, Rorippa, Rorippa Lamium, Veronica, Abutilon, Emex, Datura, Viola, Galeopsis, Papaver, Cenaurea.
<u style="single">Dictoyle cultures of the genus:</u> Gossypium, Glycine, Beta, Daucus, Phaseolus, Pisum, Solanum, Linum, Ipomoea, Vicia, Nicotiana, Lycopersicon, Arachis, Brassica, Lactuca, Cucumis, Cucurbita.
<u style="single">Monocot weeds of the genera:</u> Echinochloa, Setaria, Panicum, Digitaria, Phleum, Poa, Festuca, Eleusine, Brachiaria, Lolium, Bromus, Avena, Cyperus, Sorghum, Agropyron, Cynodon, Monochoria, Fimbristylis, Sagittaria, Eleocharis, Scirpus, Paspalum, Spochenium, Ischaeaeaum, Ischaeaumum Agrostis, Alopecurus, Apera.
<u style="single">Monocot cultures of the genera:</u> Oryza, Zea, Triticum, Hordeum, Avena, Secale, Sorghum, Panicum, Saccharum, Pineapple, Asparagus, Allium.
However, the use of the active compounds according to the invention is by no means restricted to these genera, but extends in the same way to other plants.
Depending on the concentration, the compounds are suitable for total weed control, for example on industrial and rail tracks and on paths and squares with and without tree cover. Likewise, the compounds for weed control in permanent crops, for example forests, ornamental trees, fruit, wine, citrus, nut, banana, coffee, tea, rubber, oil palm, cocoa, berry fruit and hop plants and for selective weed control in annual crops.
The active compounds according to the invention can be used with particularly good success for the selective control of mono- and dicotyledon weeds, particularly in monocotyledon crops such as barley or wheat.
The precursors of the formula (IV) also show good herbicidal activity when applied in appropriate amounts.
In addition, the active compounds according to the invention intervene in the metabolism of the plants and can therefore be used as growth regulators.
Experience has shown that the effect of plant growth regulators is that an active substance can also have several different effects on plants. The effects of the substances essentially depend on the point in time of use, based on the stage of development of the plant, on the amounts of active compound applied to the plants or their environment and on the type of application. In any case, growth regulators should influence the crop plants in a certain desired manner.
Under the influence of growth regulators, the number of leaves in the plants can be controlled in such a way that defoliation of the plants is achieved at a desired point in time. Such defoliation plays a major role in the mechanical harvesting of cotton, but is also of interest in other crops, such as, for example, in viticulture, to facilitate harvesting. Defoliation of the plants can also be carried out in order to reduce the transpiration of the plants before transplanting.
The active ingredients can be converted into the customary formulations, such as solutions, emulsions, wettable powders, suspensions, powders, dusts, pastes, soluble powders, granules, suspension emulsion concentrates, foams, active ingredient-impregnated natural and synthetic substances and very fine encapsulations in polymeric substances and in coating compositions for seeds, as well as ULV formulations.
These formulations are prepared in a known manner, for example by mixing the active ingredients with extenders, that is to say liquid solvents, pressurized liquefied gases and / or solid carriers, optionally using surface-active agents, that is to say emulsifiers and / or dispersants and / or foam-generating agents.
If water is used as an extender, organic solvents can, for example, also be used as auxiliary solvents. The following are essentially suitable as liquid solvents: aromatics, such as xylene, toluene, or alkylnaphthalenes, chlorinated aromatics or chlorinated aliphatic hydrocarbons, such as chlorobenzenes, chloroethyllenes or methylene chloride, aliphatic hydrocarbons, such as cyclohexane or paraffins, for example Petroleum fractions, alcohols, such as butanol or glycol, and their ethers and esters, ketones, such as acetone, methyl ethyl ketone, methyl isobutyl ketone or cyclohexanone, strongly polar solvents, such as dimethylformamide and dimethyl sulfoxide, and water; Liquefied gaseous extenders or carriers mean liquids which are gaseous at normal temperature and under normal pressure, for example Aerosol propellants such as halogenated hydrocarbons as well as butane, propane, nitrogen and carbon dioxide.
The following are suitable as solid carriers: for example natural rock powder, such as kaolins, alumina, talc, chalk, quartz, attapulgite, montmorillonite or diatomaceous earth and synthetic rock powder, such as highly disperse silica, aluminum oxide and silicates; as solid carriers for granules come into question: for example broken and fractionated natural rocks such as calcite, marble, pumice, sepiolite, dolomite and synthetic granules from inorganic and organic flours as well as granules from organic material such as sawdust, coconut shells, corn cobs and tobacco stems; suitable emulsifiers and / or foam-generating agents are: for example nonionic and anionic emulsifiers, such as polyoxyethylene fatty acid esters, polyoxyethylene fatty alcohol ethers, for example Alkylaryl polyglycol ethers, alkyl sulfonates, alkyl sulfates, aryl sulfonates and protein hydrolyzates; Possible dispersing agents are, for example, lignin sulfite waste liquor and methyl cellulose.
Adhesives such as carboxymethyl cellulose, natural and synthetic polymers in the form of powders, granules or latices, such as gum arabic, polyvinyl alcohol, polyvinyl acetate, and also natural phospholipids, such as cephalins and lecithins, and synthetic phospholipids can be used in the formulations. Other additives can be mineral and vegetable oils.
Dyes such as inorganic pigments, for example iron oxide, titanium oxide, ferrocyan blue and organic dyes such as alizarin, azo and metal phthalocyanine dyes and trace nutrients such as salts of iron, manganese, boron, copper, cobalt, molybdenum and zinc can be used.
The formulations generally contain between 0.1 and 95 percent by weight of active compound, preferably between 0.5 and 90%.
When used as herbicides, the active compounds according to the invention, as such or in their formulations, can also be used in a mixture with known herbicides for weed control, finished formulations or tank mixes being possible.
Known herbicides such as 1-amino-6-ethylthio-3- (2,2-dimethylpropyl) -1,3,5-triazine-2,4 (1H, 3H) -dione or N- (2- Benzthiazolyl) -N, Nʹ-dimethyl-urea for weed control in cereals; 4-amino-3-methyl-6-phenyl-1,2,4-triazin-5 (4H) -one for weed control in sugar beets and 4-amino-6- (1,1-dimethylethyl) -3-methylthio-1 , 2,4-triazin-5 (4H) -one for weed control in soybeans, in question.
Mixtures with N, N-dimethyl-Nʹ- (3-chloro-4-methylphenyl) urea; N, N-dimethyl-Nʹ- (4-isopropylphenyl) urea; 4-amino-6-t-butyl-3-ethylthio-1,2,4-triazin-5 (4H) -one; 2,4-dichlorophenoxyacetic acid; 2,4-dichlorophenoxypropionic acid; (2-methyl-4-chlorophenoxy) acetic acid; (4-chloro-2-methylphenoxy) propionic acid; 2- [4- (3,5-dichloropyrid-2-yloxy) phenoxy] propionic acid (2-benzyloxyethyl ester); - (trimethylsilylmethyl ester) or - (2,2-diethoxyethyl ester); Methyl 5- (2,4-dichlorophenoxy) -2-nitrobenzoate; 3,5-diiodo-4-hydroxybenzonitrile; 3-isopropyl-2,1,3-benzothiadiazin-4-one-2,2-dioxide; 2-chloro-N - {[(4-methoxy-6-methyl-1,3,5-triazin-2-yl) amino] carbonyl} benzenesulfonamide; 4-ethylamino-2-t-butylamino-6-methylthio-s-triazine; N-methyl-2- (1,3-benzothiazol-2-yloxy) acetanilide; N, N-diisopropyl-S- (2,3,3-trichlorallyl) thiol carbamate; N- (1-ethylpropyl) -3,4-dimethyl-2,6-dinitroaniline; 3,5-dibromo-4-hydroxy-benzonitrile; Methyl 2- [4- (2,4-dichlorophenoxy) phenoxy] propionate may be advantageous.
Surprisingly, some mixtures also show a synergistic effect.
A mixture with other known active compounds, such as fungicides, insecticides, acaricides, nematicides, bird repellants, plant nutrients and agents which improve soil structure, is also possible.
The active compounds can be used as such, in the form of their formulations or in the use forms prepared therefrom by further dilution, such as ready-to-use solutions, suspensions, emulsions, powders, pastes and granules. They are used in the customary manner, for example by watering, spraying, spraying or scattering.
The active compounds according to the invention can be applied both before and after emergence of the plants.
They can also be worked into the soil before sowing.
The amount of active ingredient used can vary over a wide range. It essentially depends on the type of effect desired. In general, the application rates are between 0.01 and 10 kg of active ingredient per hectare of soil, preferably between 0.05 and 5.0 kg per ha.
When used as growth regulators, the active compounds according to the invention can also be present in the formulations in a mixture with other known active compounds, such as fungicides, insecticides, acaricides and herbicides, and also in mixtures with fertilizers and other growth regulators.
The active compounds can be used as such, in the form of their formulations or the use forms prepared therefrom, such as ready-to-use solutions, emulsifiable concentrates, emulsions, foams, suspensions, wettable powders, pastes, soluble powders, dusts and granules. They are used in the customary manner, for example by watering, spraying, atomizing, scattering, dusting, foaming, brushing, etc. It is also possible to apply the active ingredients using the ultra-low-volume method or to inject the active ingredient preparation or the active ingredient itself into the soil. The seeds of the plants can also be treated.
The application rates can be varied over a wide range. In general, 0.01 to 50 kg, preferably 0.05 to 10 kg, of active ingredient are used per hectare of soil.
For the application period, the growth regulators are used in a preferred period, the exact delimitation of which depends on the climatic and vegetative conditions.
The preparation and use of the active compounds according to the invention can be seen from the examples below.
Manufacturing examples:
Example 1:
<chemistry id="chem0015" num="0015"><img file="EP0224831A2_D0018.tif" /></chemistry>
To 5 g (0.0113 mol) of 5-dichloroacetamido-1- (2,3,6-trichloro-4-trifluoromethyl-phenyl) pyrazole in 10 ml of glacial acetic acid, 1.2 ml (0.0129 mol) of acetic anhydride and 0 are added in succession at room temperature , 6 ml (0.0143 mol) of 98 percent nitric acid. After stirring for 20 hours, the mixture is concentrated in vacuo, the residue is taken up in 50 ml of dichloromethane and washed successively with saturated sodium bicarbonate and saturated saline. The organic phase is dried over magnesium sulfate and freed from the solvent in vacuo. 4.2 g (76.4% of theory) of 5-dichloroacetamido-4-nitro-1- (2,3,6-trichloro-4-trifluoromethylphenyl) pyrazole of melting point 112 ° C.-120 ° are obtained C.
Example 2:
<chemistry id="chem0016" num="0016"><img file="EP0224831A2_D0019.tif" /></chemistry>
To 5.2 g (0.0110 mol) of 5-dichloroacetamido-1- (2,6-dichloro-4-trifluoromethylsulfonyl) pyrazole in 10 ml of glacial acetic acid, 1.2 ml (0.0129 mol) of acetic anhydride and 0.6 were added in succession at room temperature ml (0.0143 mol) of 98 percent nitric acid. After stirring for 20 hours, the mixture is concentrated in vacuo, the residue is taken up in 50 ml of dichloromethane and washed successively with saturated sodium bicarbonate and saturated saline. The organic phase is dried over magnesium sulfate and freed from the solvent in vacuo. 4.7 g (83.9% of theory) of 5-dichloroacetamido-4-nitro-1- (2,6-dichloro-4-trifluoromethylsulfonylphenyl) pyrazole of melting point 138 ° C.-142 ° C. are obtained.
Example 3:
<chemistry id="chem0017" num="0017"><img file="EP0224831A2_D0020.tif" /></chemistry>
To 3.0 g (0.0084 mol) of 5-amino-1- (2,6-dichloro-3-fluoro-4-trifluoromethylphenyl) -4-nitropyrazole in 10 ml of dichloroacetic acid, 3.0 ml (0.031 Mol) dichloroacetyl chloride and 2 drops of 96% sulfuric acid. After stirring for 4 hours at 140 ° C., the mixture is poured onto 50 ml of water and 50 ml of dichloromethane. The organic phase is separated off, washed successively with saturated sodium hydrogen carbonate and saturated sodium chloride solution, dried over magnesium sulfate and freed from the solvent in vacuo. 3.2 g (81.5% of theory) of 5-dichloroacetamido (2,6-dichloro-3-fluoro-4-trifluoromethylphenyl) -4-nitropyrazole of melting point 115-117 ° C. are obtained.
The following 5-dichloroacetamido-4-nitro-1-aryl-pyrazoles of the general formula (I) are obtained in a corresponding manner and in accordance with the general information on the preparation:<tables id="tabl0002" num="0002"><img file="EP0224831A2_D0021.tif" /></tables><tables id="tabl0003" num="0003"><img file="EP0224831A2_D0022.tif" /></tables><tables id="tabl0004" num="0004"><img file="EP0224831A2_D0023.tif" /></tables><tables id="tabl0005" num="0005"><img file="EP0224831A2_D0024.tif" /></tables>
Preparation of the starting products of the formula (IIa)
Example IIa-1
<chemistry id="chem0018" num="0018"><img file="EP0224831A2_D0025.tif" /></chemistry>
In a boiling solution of 2.3 ml (0.034 mol) of 67 percent nitric acid and 0.1 g of urea in 30 ml of water, 10 g (0.032 mol) of 5-amino-1- (2,6-dichloro-3- fluoro-4-trifluoromethylphenyl) pyrazole in portions. The suspension is allowed to cool, the precipitate is filtered off and dried in vacuo at room temperature. The dry precipitate is added to 40 ml of 98% sulfuric acid at -5 ° C and stirred at 0-5 ° C for 12 hours. Then the reaction mixture is poured onto 350 ml of water, boiled briefly, allowed to cool to room temperature and the precipitate is filtered off. The precipitate is washed neutral with water and dried in vacuo at 40-50 ° C. 7.0 g (61% of theory) of 5-amino-1- (2,6-dichloro-3-fluoro-4-trifluoromethylphenyl) -4-nitropyrazole of melting point 156 ° C. are obtained.
The following 5-amino-1-aryl-4-nitropyrazoles of the general formula (IIa) are obtained in a corresponding manner and in accordance with the general information on the preparation<tables id="tabl0006" num="0006"><img file="EP0224831A2_D0026.tif" /></tables>
Preparation of the starting products of the formula (IV):
Example IV-1:
<chemistry id="chem0019" num="0019"><img file="EP0224831A2_D0027.tif" /></chemistry>
To 8.0 g (0.024 mol) of 5-amino-1- (2,3,6-trichloro-4-trifluoromethylphenyl) pyrazole in 80 ml of dichloromethane are added in succession at 5 ° C to 10 ° C 15.3 g (0.145 mol) of anhydrous sodium carbonate and 4.76 ml (0.048 mol) of 98 percent dichloroacetyl chloride. The mixture is stirred for 4 hours at 5 ° C-10 ° C and 13 hours at room temperature. The mixture is diluted with 80 ml dichloromethane, filtered and washed successively with water and saturated saline. The organic phase is dried over magnesium sulfate and freed from the solvent in vacuo. 10.0 g (93.5% of theory) of 5-dichloroacetamido-1- (2,3,6-trichloro-4-trifluoromethylphenyl) pyrazole of melting point 156 ° C.-161 ° C. are obtained.
In a corresponding manner and in accordance with the general information on the preparation, the following 5-dichloroacetamido-1-aryl-pyrazoles of the general formula (IV) which are unsubstituted in the 4-position are obtained:<tables id="tabl0007" num="0007"><img file="EP0224831A2_D0028.tif" /></tables><tables id="tabl0008" num="0008"><img file="EP0224831A2_D0029.tif" /></tables><tables id="tabl0009" num="0009"><img file="EP0224831A2_D0030.tif" /></tables><tables id="tabl0010" num="0010"><img file="EP0224831A2_D0031.tif" /></tables>
Preparation of the starting products of the formula (V)
Example V-1
<chemistry id="chem0020" num="0020"><img file="EP0224831A2_D0032.tif" /></chemistry>
470 g of 3,5-dichloro-2,4-difluorobenzotrifluoride are placed in 1000 ml of ethanol and 142 g of hydrazine hydrate are metered in and then heated to reflux for 3 hours. The solvent is then distilled off under reduced pressure and the residue is stirred into 1 l of cold water. After 30 minutes, the product is filtered off with suction and the solid product is dried in a circulating air cabinet. 445 g of 2,6-dichloro-3-fluoro-4-trifluoromethyl-phenylhydrazine with a melting point of 50 to 51 ° C. are obtained.
Example V-2
<chemistry id="chem0021" num="0021"><img file="EP0224831A2_D0033.tif" /></chemistry>
100 g of 2,3,4-trichlorobenzotrifluoride are introduced, 200 ml of pyridine are added, then 100 g of hydrazine hydrate and then heated to the reflux temperature for 12 hours. Then 90% of the pyridine is distilled off and the remaining residue is stirred into 250 ml of water. The crystalline product is filtered off, washed with a little water and dried. 78 g of 2,3-dichloro-4-trifluoromethyl-phenylhydrazine with a melting point of 79 to 80 ° C. are obtained.
The compounds of the formula (V) listed in the following table are obtained in a corresponding manner, in particular analogously to Example V-1 and in accordance with the general information on the preparation:<tables id="tabl0011" num="0011"><img file="EP0224831A2_D0034.tif" /></tables><tables id="tabl0012" num="0012"><img file="EP0224831A2_D0035.tif" /></tables>
Preparation of the starting products of the formula (VIII)
Example VIII-1
<chemistry id="chem0022" num="0022"><img file="EP0224831A2_D0036.tif" /></chemistry>
42.6 g (0.162 mol) of 2,6-dichloro-3-fluoro-4-trifluoromethylphenylhydrazine are dissolved in 250 ml of methanol pa, mixed with 35 mg of Titriplex III and heated to reflux. 40 ml (= 44 g / 0.049 mol) of 2-chloroacrylonitrile 98% strength are added dropwise at this temperature within 30 minutes. The mixture is stirred at reflux temperature for 5 hours. The reaction mixture is evaporated to dryness. The residue is suspended in 100 ml of trifluoroacetic acid and slowly warmed up. The mixture is stirred at 80-83 ° C for 8 hours. The trifluoroacetic acid is distilled off in a slight vacuum, the residue is dissolved in 250 ml of methanol and 55 g (0.52 mol) of anhydrous sodium carbonate are added. The mixture is stirred for 2 hours, the solvent is stripped off in vacuo and the residue is suspended in 1 liter of water. The precipitate is filtered off, washed neutral with water and dried in vacuo at 50 ° C.
41.2 g (81% of theory) of 5-amino-1- (2,6-dichloro-3-fluoro-4-trifluoromethylphenyl) pyrazole with a melting point of 70-78 ° C. are obtained.
The following 5-amino-1-arylpyrazoles of the general formula (VIII) are obtained in a corresponding manner and in accordance with the general information on the preparation:<tables id="tabl0013" num="0013"><img file="EP0224831A2_D0037.tif" /></tables><tables id="tabl0014" num="0014"><img file="EP0224831A2_D0038.tif" /></tables>
Examples of use
In the following application examples, the compound listed below was used as the reference substance:<chemistry id="chem0023" num="0023"><img file="EP0224831A2_D0039.tif" /></chemistry> 5- (ω-Chlorobutyradmido) -4-nitro-1- (2,6-dichloro-4-trilfluoromethylphenyl) pyrazole (known from DE-OS 3 402 308).
Example A
Pre-emergence test
Solvent: 5 parts by weight of acetone Emulsifier: 1 part by weight of alkylaryl polyglycol ether
To produce a suitable preparation of active compound, 1 part by weight of active compound is mixed with the stated amount of solvent, the stated amount of emulsifier is added and the concentrate is diluted with water to the desired concentration.
Seeds of the test plants are sown in normal soil and watered with the preparation of active compound after 24 hours. The amount of water per unit area is expediently kept constant. The concentration of active substance in the preparation is irrelevant, the only decisive factor is the amount of active substance applied per unit area. After three weeks, the degree of damage to the plants is rated in% damage compared to the development of the untreated control. It means: 0% = no effect (like untreated control) 100% = total annihilation
In this test, for example, the compounds according to the preparation examples: 1, 2, 3 and 15 show a clear superiority in the herbicidal activity in weeds such as Amaranthus, Galium, Sinapis, Stellaria and Setaria over the comparison substance (A).
Example B
Post emergence test
Solvent: 5 parts by weight of acetone Emulsifier: 1 part by weight of alkylaryl polyglycol ether
To produce a suitable preparation of active compound, 1 part by weight of active compound is mixed with the stated amount of solvent, the stated amount of emulsifier is added and the concentrate is diluted with water to the desired concentration.
Test plants which have a height of 5-15 cm are sprayed with the active substance preparation in such a way that the desired amounts of active substance are applied per unit area. The concentration of the spray liquor is chosen so that the desired amounts of active compound are applied in 2000 l of water / ha. After three weeks, the degree of damage to the plants is rated in% damage compared to the development of the untreated control. It means: 0% = no effect (like untreated control) 100% = total annihilation
In this test, for example, the compounds according to the preparation examples: 2 and 15 show a clear superiority in the activity against weeds such as Amaranthus, Galium, Matricaria, Sinapis and Panicum with comparable crop selectivity in, for example, wheat compared to the comparative substance (A).
Example C
Defoliation and drying of the leaves of cotton
Solvent: 30 parts by weight of dimethylformamide Emulsifier: 1 part by weight of polyoxyethylene sorbitan monolaurate
To produce a suitable preparation of active compound, 1 part by weight of active compound is mixed with the stated amounts of solvent and emulsifier and the mixture is made up to the desired concentration with water.
Cotton plants are grown in the greenhouse until the 5th following leaf is fully developed. At this stage, the plants are sprayed dripping wet with the active ingredient preparations. After 1 week, leaf falling and drying out of the leaves are assessed in comparison to the control. It means: 0 no drying out of the leaves, no falling leaves + slight drying of the leaves, little leaf fall ++ strong drying out of the leaves, heavy leaf fall +++ very strong drying of the leaves, very strong leaf fall
In this test, for example, the compounds according to Preparation Examples 1, 3, 4, 9 and 15 show a clear effect.
54 sheets
Sheet 1 Sheet 2 Sheet 3 Sheet 4 Sheet 5 Sheet 6 Sheet 7 Sheet 8 Sheet 9 Sheet 10 Sheet 11 Sheet 12 Sheet 13 Sheet 14 Sheet 15 Sheet 16 Sheet 17 Sheet 18 Sheet 19 Sheet 20 Sheet 21 Sheet 22 Sheet 23 Sheet 24 Sheet 25 Sheet 26 Sheet 27 Sheet 28 Sheet 29 Sheet 30 Sheet 31 Sheet 32 Sheet 33 Sheet 34 Sheet 35 Sheet 36 Sheet 37 Sheet 38 Sheet 39 Sheet 40 Sheet 41 Sheet 42 Sheet 43 Sheet 44 Sheet 45 Sheet 46 Sheet 47 Sheet 48 Sheet 49 Sheet 50 Sheet 51 Sheet 52 Sheet 53 Sheet 54
Every citation, both ways
| Document | Relation | Office | Cited during |
|---|---|---|---|
| WO9943643A3 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| EP0320764A3 | Cited by | European Patent Office (EPO) | Search report |
| EP0320765A3 | Cited by | European Patent Office (EPO) | Search report |
| US5930651A | Cited by | United States of America | Search report |
| EP0335156A1 | Cited by | European Patent Office (EPO) | Search report |
| US6465693B2 | Cited by | United States of America | Applicant |
| EP0302327A1 | Cited by | European Patent Office (EPO) | Search report |
| US6235936B1 | Cited by | United States of America | Applicant |
| WO9943643A2 | Cited by | World Intellectual Property Organization (WIPO) | International search |
| EP0320764A2 | Cited by | European Patent Office (EPO) | Search report |
| EP0320765A2 | Cited by | European Patent Office (EPO) | Search report |
| EP0295118A1 | Cited by | European Patent Office (EPO) | Search report |
| DE3402308A1 | Cites | Germany | Search report |
12 members in 8 offices
Priority claims10
| Document | Office | Kind | Date |
|---|---|---|---|
| 3543033 | Germany | A | |
| 3543033 | Germany | A | |
| 3543033 | Germany | – | |
| 3617977 | Germany | A | |
| 3617977 | Germany | A | |
| 3617977 | Germany | – | |
| 3543033 | – | – | – |
| 3617977 | – | – | – |
| DE19853543033 | – | – | – |
| DE19863617977 | – | – | – |
Members12
| Document | Office | Kind | |
|---|---|---|---|
| DK583786D0 | Denmark | D0 | |
| DK583786A | Denmark | A | |
| EP0224831A2This record | European Patent Office (EPO) | A2 | |
| DE3617977A1 | Germany | A1 | |
| JPS62132866A | Japan | A | |
| ZA869160B | South Africa | B | |
| BR8605974A | Brazil | A | |
| EP0224831A3 | European Patent Office (EPO) | A3 | |
| HUT44020A | Hungary | A | |
| US4764202A | United States of America | A | |
| HU199427B | Hungary | B | |
| US4909832A | United States of America | A |
16 legal events, as the office reported them to INPADOC
Over the term
Point at a mark for the eventEvents
| Event | Code | |
|---|---|---|
| Information on inventor provided before grant (corrected)RIN1 | RIN1 | |
| Information on inventor provided before grant (corrected)RIN1 | RIN1 | |
| Information on inventor provided before grant (corrected)RIN1 | RIN1 | |
| Information on inventor provided before grant (corrected)RIN1 | RIN1 | |
| Information on inventor provided before grant (corrected)RIN1 | RIN1 | |
| Information on inventor provided before grant (corrected)RIN1 | RIN1 | |
| Information on inventor provided before grant (corrected)RIN1 | RIN1 | |
| Application withdrawn (corrected)WithdrawnR18W | R18W | |
| Application withdrawnWithdrawn18W | 18W | |
| Information on the status of an ep patent application or granted ep patentGrantedSTAA | STAA | |
| First examination report despatched17Q | 17Q | |
| Designated contracting statesAK | AK | |
| Search report despatchedPUAL | PUAL | |
| Request for examination filed17P | 17P | |
| Designated contracting statesAK | AK | |
| Public reference made under article 153(3) epc to a published international application that has entered the european phasePUAI | PUAI |
Numbers
- Publication
- 0224831
- Publication, DOCDB
- 0224831
- Publication, EPODOC
- EP0224831
- Application
- 86116246
- Application, DOCDB
- 86116246
- Application, EPODOC
- EP19860116246
Titles3
- German
- 5-Dichloracetamido-4-nitro-1-aryl-pyrazole
- English
- 5-Dichloroacetamido-4-nitro-1-aryl-pyrazoles
- French
- 5-Dichloroacetamido-4-nitro-1-aryl-pyrazoles
Classification
- CPC, 4
- C07C243/00
- A01N43/56
- C07D231/38
- C07D231/40
- IPC, 4
- A01N43 56
- C07D231 16
- C07D231 38
- C07D231 40
Designated states9
- Contracting states, 9
- Austria
- Belgium
- Switzerland
- Germany
- France
- United Kingdom
- Italy
- Liechtenstein
- Netherlands (Kingdom of the)