Patent ID: 7053160

Claim:
A compound of the formula (I), where M is Ti, Zr or Hf, R 1 are identical or different and are each a radical Si(R 12 ) 3 , where R 12 are identical or different and are each a hydrogen atom or a C 1 –C 40 -group, or R 1 is a C 1 –C 30 -group, or two or more radicals R 1 may be connected to one another in such a way that the radicals R 1 and the atoms of the cyclopentadienyl ring which connect them form a C 4 –C 24 -ring system which may in turn be substituted, R 2 are identical or different and are each a radical Si(R 12 , where R 12 are identical or different and are each a hydrogen atom or a C 1 –C 40 -group, or R 2 is a C 1 –C 30 -group, or two or more radicals R 2 may be connected to one another in such a way that the radicals R 2 and the atoms of the cyclopentadienyl ring which connected them form a C 4 –C 24 -ring system which may in turn be substituted, R 3 is C 7 –C 30 -alkylaryl, fluorinated C 6 –C 24 -aryl, or fluorinated C 7 –C 30 -alkylaryl, X is a halogen atom, n is from 0 to 4, n′ is from to 4, k is 1, B is a bridging structural element between the two cyclopentadienyl rings defined as M 3 R 13 R 14 , wherein M 3 is carbon or silicon and R 13 and R 14 are identical or different and are C 1 –C 10 -alkyl, C 6 –C 14 -aryl or trimethyl silyl, and one or both cyclopentadienyl rings are substituted in such a way that they form an indenyl ring.