ZIRCONIUM COMPOUND HAVING BIS SUBSTITUTED CYCLOPENTADIENYL LIGAND OF BRIDGED STRUCTURE

摘要

NEW MATERIAL:A compound of the formula [Y is silicon or germanium; R -C5H4-n and R -C5H4-q are (substituted) cyclopentadienyl; n and q are 0-4, but the cases of n=q=0 and n=q=4 are excluded; R1 is H, silyl or hydrocarbon; R2 is H or hydrocarbon; X is H, halogen or hydrocarbon]. EXAMPLE:Dimethylsilylbis(methylcylopentadienyl)zirconium dichloride. USE:A catalyst component for stereoregular olefin polymerization. PREPARATION:A bis substituted cyclopentadienyl bridge type biligand having a bridged structure is reacted with an alkyl lithium, etc., to form a lithium compound, which is reacted with ZrX4 is a reaction solvent such as tetrahydrofuran at 0-70 deg.C to provide the objective compound.