Patent ID: 8222174

Claim:
An ansa-metallocene, comprising: a compound having the formula: (X 1 )(X 2 )(X 3 )(X 4 )M 1 , wherein: M 1 comprises titanium, zirconium, or hafnium; X 1 and X 2 independently comprise a substituted cyclopentadienyl, a substituted indenyl, or a substituted fluorenyl; a first substituent on X 1 and X 2 comprises a bridging group having the formula E(Cyc), wherein E is a carbon atom, a silicon atom, a germanium atom, or a tin atom, and E is bonded to both X 1 and X 2 , and wherein Cyc is a substituted or an unsubstituted carbon chain of from 4 to 6 carbon atoms in length with each end of the substituted or unsubstituted carbon chain connected to E to form a ring structure; a second substituent on X 1 or X 2 comprises a substituted or an unsubstituted alkenyl group; and X 3 and X 4 independently comprise a halide, a hydrocarbyl group, H, BH 4 , a hydrocarbyloxide group, a hydrocarbylamino group, a trihydrocarbylsilyl group, an amido group, a phosphido group, OBR A 2 , or SO 3 R A , wherein R A is an alkyl group or an aryl group.