Patent ID: 7314903

Claim:
An organometallic compound obtained by contacting: a) a compound having the following formula (I): wherein R a is a linear or branched, saturated or unsaturated, C 1 –C 10 alkyl, C 6 –C 20 aryl, C 7 –C 20 arylalkyl or C 7 –C 20 alkylaryl group, optionally containing O, S, N, P, Si or halogen atoms; or R a can join R d to form a C 4 –C 7 ring; R b , R c and R d , equal to or different from each other, are hydrogen atoms, halogen atoms, linear or branched, saturated or unsaturated, C 1 –C 10 alkyl, C 6 –C 20 aryl, C 7 –C 20 arylalkyl or C 7 –C 20 alkylaryl groups, optionally containing O, S, N, P, Si or halogen atoms, or two or more adjacent substituents R b , R c , and R d form one or more C 4 –C 7 rings, optionally containing O, S, N, P or Si atoms, that can bear substituents; with b) a Lewis acid of formula (II): MtR 1 3 (II) wherein Mt is a metal belonging to Group 13 of the Periodic Table of the Elements; R 1 , equal to or different from each other, are halogen atoms, halogenated C 6 –C 20 aryl or halogenated C 7 –C 20 alkylaryl groups; two R 1 groups can also form with the metal Mt one condensed ring.