Patent ID: 6888017

Claim:
A compound represented by the formula: wherein: M is selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten; R 1 and R 2 are identical or different, and are one of a hydrogen atom, a C 1 -C 10 alkyl group, a C 1 -C 10 alkoxy group, a C 6 -C 10 aryl group, a C 6 -C 10 aryloxy group, a C 2 -C 10 alkenyl group, a C 2 -C 4 alkenyl group, a C 7 -C 40 arylalkyl group, a C 7 -C 40 alkylaryl group, a C 8 -C 40 arylalkenyl group, or a halogen atom; R 5 and R 6 are identical or different, and are one of a hydrogen atom, a halogen atom, a C 1 -C 10 alkyl group which may be halogenated, a C 6 -C 10 aryl group which may be halogenated, a C 2 -C 10 alkenyl group, a C 7 -C 40 arylalkyl group, a C 7 -C 40 alkylaryl group, a C 8 -C 40 arylalkenyl group, a â€”NR 2 15 , â€”SR 15 , â€”OR 15 , â€”OSiR 3 15 or â€”PR 2 15 radical, wherein R 15 is one of a halogen atom, a C 1 -C 10 alkyl group, or a C 6 -C 10 aryl group; R 7 is wherein: R 17 to R 24 are as defined for R 1 and R 2 , or two or more adjacent radicals R 17 to R 24 , including R 20 and R 21 , together with the atoms connecting them form one or more rings; M 2 is carbon, silicon, germanium or tin; and the radicals R 3 , R 4 and R 10 are identical or different and have the meanings stated for R 5 and R 6 , or two adjacent R 10 radicals are joined together to form a ring.