Patent ID: 7507688

Claim:
A monocyclopentadienyl complex which comprises the structural feature of the formula (Cp)(—Z—A) m M (I), where the variables have the following meanings: Cp is a cyclopentadienyl system, Z is a bridge between A and Cp of the formula, where L 1B are each, independently of one another, carbon or silicon, R 1B ,R 2B are each, independently of one another hydrogen, C 1 -C 20 -alkyl, C 2 -C 20 -alkenyl, C 6 -C 20 -aryl, alkylaryl having from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part or SiR 3B 3 , where the organic radicals R 1B and R 2B may be substituted by halogens, and the two radicals R 1B and R 2B , or either R 1B or R 2B and A may be joined to form a five- or six-membered ring, R 3B are each, independently of one another, hydrogen, C 1 -C 20 -alkyl, C 2 -C 20 -alkenyl, C 6 -C 20 -aryl or alkylaryl having from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part and two radicals R 3B may be joined to form a five- or six-membered ring, A has the formula (IIIb): where E 1C is nitrogen, phosphorus, sulfur or oxygen, R 1c -R 3c are each, independently of one another, hydrogen, C 1 -C 20 -alkyl, C 2 -C 20 -alkenyl, C 6 -C 20 -aryl, alkylaryl having from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part or SiR 5C 3 , where the organic radicals R 1C -R 3C may be substituted by halogens or nitrogen or further C 1 -C 20 -alkyl groups, C 2 -C 20 -alkenyl groups, C 6 -C 20 -aryl groups, alkylaryl groups having from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part or SiR 5C 3 and two vicinal radicals R 1c -R 3c or radical R 1c and Z may be joined to form a five- or six-membered ring, R 5C are each, independently of one another, hydrogen, C 1 -C 20 -alkyl, C 2 -C 20 -alkenyl, C 6 -C 20 -aryl or alkylaryl having from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part and two radicals R 5C may be joined to form a five- or six-membered ring, and p is 0 when E 1C is sulfur or oxygen and 1 when E 1C is nitrogen or phosphorus, M is a metal selected from the group consisting of titanium in the oxidation state 3, vanadium, chromium, molybdenum and tungsten, and m is 1, 2 or 3.