Patent ID: 6153777
Filing Date: 2000-11-28
Classification: C07F,Y10S

Abstract:
A process of synthesizing an ansa-metallocene complex of the formula: ##STR4## wherein Cp independently and in each occurrence is a cyclopentadienyl, indenyl, fluorenyl, or related group that can .PI.-bond to the metal, or hydrocarbyl, alkyl, aryl, silyl, halo, halohydrocarbyl, hydrocarbylmetalloid, or halohydrocarbylmetalloid substituted derivative of said cyclopentadienyl, indenyl, fluorenyl, or related group,Z is a bridging group which links the Cp groups,M.sup.1 is a group 4 metal,R is a hydrogen, hydrocarbyl group having from 1 to 40 carbon atoms, or silyl group, or substituted derivative of said hydrocarbyl or silyl group wherein each R may be the same or different,Y is a bridging group that links the two NR groups, said process comprising:reacting a chelated bisamide group 4 metal complex with an ansa-bis-cyclopentadienyl dianion reagent to provide said ansa-metallocene complex.