Patent ID: 7795167

Claim:
A cyclopentadienyl complex of group 6 comprising at least one silyl group, wherein the silyl group comprises at least one halogen substituent the cyclopentadienyl complex is a monocyclopentadienyl complex comprising a formula of Cp-R 15A v -A 1A -M 1A -X A t , wherein Cp-R 15A v -A 1A is E 1A -E 5A are carbon; R 1A -R 4A are each, independently of one another, hydrogen, C 1 -C 22 -alkyl, C 2 -C 22 -alkenyl, C 6 -C 22 -aryl, and arylalkyl comprising from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part, wherein radicals R 1A -R 4A can be substituted by at least one halogen, and/or two vicinal radicals R 1A -R 4A can be joined to form a five-, six- or seven-membered ring, and/or two vicinal radicals R 1A -R 4A can be joined to form a five-, six- or seven-membered heterocycle comprising at least one atom from the group consisting of N, P, O and S, with the proviso that at least one R 1A -R 4A is SiR 2 D; D is fluorine, chlorine, bromine or iodine; R are each, independently of one another, hydrogen C 1 -C 22 -alkyl, C 2 -C 22 -alkenyl, C 6 -C 22 -aryl, and arylalkyl comprising from 1 to 16 carbon atoms in the alkyl part and from 6 to 21 carbon atoms in the aryl part, wherein radicals R can be substituted by at least one halogen, and/or two radicals R can be joined to form a five-, six- or seven-membered ring; R 15A is a divalent bridge between A 1A and Cp selected tram the group consisting at R 16A -R 19A are each, independently of one another, hydrogen, C 1 -C 20 -alkyl, C 2 -C 20 -alkenyl, C 6 -C 20 -aryl, and arylalkyl comprising from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms in the aryl part, wherein radicals R 16A -R 19A can be substituted by at least one halogen, and/or two geminal or vicinal radicals R 16A -R 19A can be joined to form a five- or six-membered ring: A 1A in an uncharged donor group —NR 23A — or —NR 22A 2 ; R 22A are each, independently of one another, C 1 -C 10 -alkyl, C 2 -C 22 -alkenyl, C 6 C 22 -aryl, and arylalkyl comprising from 1 to 10 carbon atoms in the alkyl part and from 6 to 20 carbon atoms in the aryl part, wherein radicals R 22A can be substituted by at least one halogen and/or two radicals R 22A can be joined to form a five, six- or seven-membered ring; M 1A is a metal selected from the group consisting of chromium, molybdenum, and tungsten, X A is fluorine, chlorine, bromine, or iodine; t is 1 or 2, with the proviso that the cyclopentadienyl complex is uncharged; and v is 0 or 1.