| 摘要 |
Disclosed is a process for preparing a methyl-transition metal compound of the general formula (1) (Q)m(CpR a)(Cp'R'a')M(CH3)n X2-n (1) wherein: Cp is a cyclopentadienyl, an indenyl or a fluorenyl radical; R and R' are each independently alkoxy, alkylamino, dialkylamino, aryl-alkyl, aryloxy-alkyl or phosphine; 0 ~ a ~ 5 and 0 ~ a' ~ 5; Cp' is one of the groups Cp, or when a' is 1, Cp'R' can be NR' wherein R' is an alkyl or aryl radical; Q is a single-membered or multi-membered bridge <IMG> between Cp and Cp', wherein R1 and R2 are identical or different and are a hydrogen atom, a C1-C10 alkyl group or a C6-C10 aryl group; and Z is carbon, silicon or germanium; and b is 1, 2, or 3; M is a transition metal of the groups III to VI; X is halogen; n is 1 or 2; and m is 0 or 1. The process comprises reacting one or more halogen-transition metal compounds of formula (2) (Q)m(CpR a)(Cp'R'a')MX2 (2) with trimethylaluminum in a hydrocarbon solvent, then admixing into the reaction solution one or more fluorides selected from the group consisting of alkali metal fluorides and alkaline earth metal fluorides. One or more complexes comprising aluminum and fluoride are formed, and subsequently are separated from the reaction solution.
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