Patent ID: 8426536

Claim:
A dinuclear metallocene compound having the formula (IA)=(IB); wherein: (IA) is (IB) is wherein: X 1 , X 2 , X 13 , and X 14 independently are hydrogen; BH 4 ; a halide; a hydrocarbyl group, hydrocarbyloxide group, hydrocarbyloxylate group, hydrocarbylamino group, or hydrocarbylsilyl group, any of which having up to 20 carbon atoms; or OBR A 2 or SO 3 R A , wherein R A is an alkyl group or aryl group having up to 12 carbon atoms; X 3 and X 15 independently are a substituted or unsubstituted cyclopentadienyl, indenyl, or fluorenyl group, any substituents on X 3 and X 15 independently are a hydrogen atom or a substituted or unsubstituted alkyl or alkenyl group; X 4 and X 16 independently are a substituted cyclopentadienyl, indenyl, or fluorenyl group, any substituents on X 4 and X 16 other than an alkenyl linking group independently are a hydrogen atom or a substituted or unsubstituted alkyl or alkenyl group; M 1 and M 4 independently are Zr, Hf, or Ti; each R X , R Y , and R Z independently is a hydrogen atom, or a substituted or unsubstituted aliphatic, aromatic, or cyclic group, or a combination thereof; and each n independently is an integer in a range from 0 to 12, inclusive; with the proviso that (IA) is not the same as (IB).