Patent ID: 6426426
Filing Date: 2002-07-30
Classification: C07F,Y10S

Abstract:
A procedure for obtaining a titanocene compound having a formula (I): where:each L is independently cyclopentadiene or pentamethylcyclopentadiene; R1, R2, and R3 are equal to or different from each other and are selected from the group consisting of: hydrogen, an alkyl group of 1 to 4 carbon atoms, and OR4, where R4 is an alkyl group of 1 to 4 carbon atoms; at least one of R1, R2, and R3 is hydrogen; the procedure comprising the following steps:(a) preparation of a Grignard reagent by reaction in a polar solvent of magnesium metal with a compound having a formula (II): where R1, R2, and R3 have already been defined and Br is bromine;(b) reaction of the Grignard reagent in solution with titanocene dichloride in a 2:1 ratio to yield a reaction medium; (c) precipitation with a non-polar solvent of chlorobromomagnesium salts that are generated in the reaction medium and filtration of the reaction medium to obtain a solution of the compound having the formula (I).