PREPARATION OF MONOCYCLOPENTADIENYL METAL COMPLEXES BY NUCLEOPHILIC SUBSTITUTION OF BIS(CYCLOPENTADIENYL) METAL COMPLEXES

摘要

Bridged monocyclopentadienyl derivatives of a Group 4 metal are prepared by contacting a corresponding bis(cyclopentadienyl) metal complex with an alkali metal derivative or alkaline earth metal derivative of a hydrocarbyl ligand R, which is optionally substituted with one or more amino, phosphino, ether, thioether, or silyl groups. The bis(cyclopentadienyl) Group 4 metal complexes can be prepared by contacting a compound corresponding to one of the formulas (Cp)3MQnXt, (Cp)2MQnXt+1, or CpMQnXt+2 and a dianionic salt compound corresponding to the formula: (L+x)y(Cp*-Z-Y)-2 or ((LX')+x)y(Cp*-Z-Y)-2. An addition polymerization catalyst comprising a bis(cyclopentadienyl) Group 4 metal complex and an activating cocatalyst, and an addition polymerization process using such a catalyst.