Process for the production of monohalide or dihalide metallocene compounds

formula (II) --: (Cp) (ZR) (A) ML' (II) -- the inside of [type and Cp are cyclopentadienyl groups, and; (ZR) is a 橋架け machine of 2 values between Cp and A --; A -- a cyclopentadienyl group or O --it is S, NR, and PR (the inside of a formula, and R2 -- 炭化水素基 -- being certain), ; M is a zirconium, titanium, or hafnium, ; L' is a hydrocarbon machine, the range of; r is 0 to 2, and; y with the compound of] equal to 4, TL (inside of formula and T are metal of 3*13 fellows of periodic law table, ; L is halogen, and; and w are equal to oxidation state of metal T) ; TL (among a formula) T is a nonmetallic element of 13*16 fellows of a periodic law table (the new IUPAC version), and; and w are equal to the oxidation state of the metal T --; O=TL (among a formula) ; O is an oxygen atom combined with T through a double bond, ; and w carry out oxidation state 引く 2 of the element T, etc. , and are [T is chosen from the group which consists of C, P and S, ], and it is; RC (O) L (among a formula). R is a production method of ジハライド or a mono-halide metallocene compound which consists of contacting the halogenation agent chosen from the group which consists of a certain; L and HL with a hydrocarbon machine.