Metallocenes having bicyclic cyclopentadiene derivatives as...

Details Metallocenes having bicyclic cyclopentadiene derivatives as... Metallocenes having bicyclic cyclopentadiene derivatives as...

C - Chemistry, Metallurgy

07

F

C07F 17/00 (2006.01) C08F 10/00 (2006.01) C08F 4/639 (2006.01) C08F 4/6392 (2006.01) C08F 110/06 (2006.01)

Patent

CA 2057477

HOE 90/F 368 Abstract of the Disclosure Metallocenes having bicyclic cyclopentadiene derivatives as ligands, processes for their preparation and their use as catalysts The invention relates to a process for the preparation of a compound of the formula XI (XI) Image wherein preferably M1 is zirconium, the radicals R1 are alkyl, the radicals R2 are halogen or alkyl, R3 is dimethylsilyl or ethylane and n is 2-18, wherein a compound of the formula II Image (II) is reacted with an alkali metal or alkaline earth metal salt of a malonic ester and then with an alkyl halide, the reaction product is converted by decarboxylation into the corresponding lactone, which is further reacted by known methods to give the compound XI. The compounds of the formula XI, some of which are novel, can advantageously be used as catalysts for olefin polymerization.

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