Patent ID: 7232870

Claim:
A bridged cyclopentadienyl-dicarbollide metallocene complex having the formula (I): {L[(Cp)(C 2 B 9 R 1 10 )]}MR (I) wherein: Cp is a group selected from the group consisting of cyclopentadienyl, indenyl, tetrahydroindenyl, and fluorenyl, wherein said Cp group is unsubstituted or substituted by one or more radicals selected from the group consisting of C 1 –C 10 alkyl, C 2 –C 10 alkenyl, C 3 –C 10 cycloalkyl, C 1 –C 10 alkoxy, and C 6 –C 15 aryl, where each pair of adjacent radicals on the ring together may form a cyclic group; each R 1 is independently hydrogen, halogen, C 1 –C 10 alkyl, or C 2 –C 10 alkenyl; L is C 1 –C 4 alkylene, which is unsubstituted or substituted by one or more radicals selected form the group consisting of C 1 –C 10 alkyl, C 2 –C 10 alkenyl, C 3 –C 10 cycloalkyl, C 1 –C 10 alkoxy, C 6 –C 15 aryl, and Si(R 2 ) 2 , wherein each R 2 is independently selected from the group consisting of hydrogen, C 1 –C 10 alkyl, C 2 –C 10 alkenyl, C 1 –C 10 alkoxy, C 3 –C 10 cycloalkyl, and C 6 –C 15 aryl, wherein L bonds to both Cp ring and the cage of C 2 B 9 R 1 10 ; R is selected from the group consisting of hydrogen, halogen, R 3 , OR 3 , SR 3 , NR 3 R 4 , PR 3 R 4 , and ZSiR 3 (R 4 ) 2 , wherein each R 3 is independently selected from the group consisting of C 1 –C 10 alkyl, C 2 –C 10 alkenyl, C 3 –C 10 cycloalkyl, and C 6 –C 15 aryl, and each R 4 is independently selected from the group consisting of hydrogen, C 1 –C 10 alkyl, C 2 –C 10 alkenyl, C 3 –C 10 cycloalkyl and C 6 –C 15 aryl, and Z is C 1 –C 10 alkylene; and M is Ti, Zr, or Hf.