| 摘要 |
Bicyclopentadienyl Group 4 transition metal complexes containing a conjugate d diene ligand group wherein the diene is bound to the transition metal either in the form of a .sigma.-complex or a .pi.-compl ex are readily prepared by reacting in any order. a) a Group 4 metal salt corresponding to the formula M'X3 or M"X4, or a Lewis base adduct thereof, b) a conjugated diene, D', c) a reducing agent, and d) a compound of the formula: CpM* or (Cp-Cp)M*n, wherein M' is titanium, zirconi um or hafnium in the +3 formal oxidation state; M" is titanium, zirconium or hafnium in the +4 formal oxidation state; X is a halide, C1-6 hydrocarbyloxy or di(C1-6 hydrocarbyl)amido group; D' is an uncoordinated dime having the same number of carbons as D and the same substitution pattern as D; M* is a Group 1 or 2 metal cation, a Grignard reagent cation or a tri(C1-6 hydrocarbyl)silyl group; and n is 1 when M* is a Group 2 metal cation and n is 2 when M* is a Group 1 metal cation, a Grignard reagent cation, or a trihydrocarbylsisyl group with the proviso that reagents a) and d) are not contacted with one another in the absence of reagent c). |
