Patent ID: 6903229

Claim:
A compound represented by the formula: wherein: M 1 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 40 alkenyl group, a C 7 -C 40 arylalkyl group, a C 7 -C 40 alkylaryl group, a C 8 -C 40 arylalkenyl group, an OH group or a halogen atom, or a conjugated diene which is optionally substituted with one or more hydrocarbyl, tri(hydrocarbyl)silyl groups or tri(hydrocarbyl)silylhydrocarbyl groups, said diene having up to 30 atoms not counting hydrogen; R 3 are identical or different and are each a halogen atom, a C 3 -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 —NR′ 2 , —SR′, —OR′, —OSiR′ 3 or —PR′ 2 radical, wherein R′ is one of a halogen atom, a C 1 -C 10 alkyl group, or a C 6 -C 10 aryl group; R 4 to R 7 are identical or different and are hydrogen, as defined for R 3 or two or more adjacent radicals R 5 to R 7 together with the atoms connecting them form one or more rings; R 13 is —B(R 14 )—, —Al(R 14 )—, —Ge—, —Sn—, —O—, —S—, —SO—, —SO 2 —, —N(R 14 )—, —CO—, —P(R 14 )—, or —P(O)(R 14 )—, or an amidoborane radical; wherein: R 14 , R 15 and R 16 are identical or different and are a hydrogen atom, a halogen atom, a C 1 -C 20 alkyl group, a C 1 -C 20 fluoroalkyl or silaalkyl group, a C 6 -C 30 aryl group, a C 6 -C 30 fluoroaryl group, a C 1 -C 20 alkoxy group, a C 2 -C 20 alkenyl group, a C 7 -C 40 arylalkyl group, a C 8 -C 40 arylalkenyl group, a C 7 -C 40 alkylaryl group, or R 14 and R 15 , together with the atoms binding them, form a cyclic ring; or, R 13 is represented by the formula: wherein: R 17 to R 24 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 40 alkenyl group, a C 7 -C 40 arylalkyl group, a C 7 -C 40 alkylaryl group, a C 8 -C 40 arylalkenyl group, an OH group, or a halogen atom, 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 one or more carbons, silicon, germanium or tin; R 8 , R 10 and R 12 are identical or different and have the meanings stated for R 4 to R 7 ; and R 9 and R 11 are identical or different and are each a Group 14 radical having from 2 to 20 carbon atoms or are each a primary, secondary or tertiary butyl group, an aryl group, an isopropyl group, trialkyl silyl group, or a fluoroalkyl group.