Patent ID: 7019145
Filing Date: 2006-03-28
Classification: C07F

Abstract:
1. A process for preparing metallic complexes of formula (I): in which: M represents a metal selected from the metals of group 8 of the Periodic Table as published in the Handbook of Chemistry and Physics, 65th Edition, 1984–1985; X represents O, NR Y R R when Y in which n is an integer from 1 to 3; X is as defined above; R and R′, which may be identical or different, take any of the meanings given above for R e , it being understood that, when n is 2 or 3, only one silicon atom of said chain may be substituted with one or two alkenyl or alkynyl groups; or alternatively when Y 1 and Y 2 independently represent SiR d R e , two groups R d linked to separate silicon atoms together form a saturated hydrocarbon-based chain, the two groups R d together with said silicon atoms and X forming a 6- to 10-membered ring; or alternatively when Y 1 and Y 2 independently represent CR b R c , two groups R b linked to separate carbon atoms together form a saturated hydrocarbon-based chain, the two groups R b together with the carbon atoms that bear them and X form a 6- to 10-membered ring; and R L represents a carbene of formula (II): in which: A and B independently represent C or N, it being understood that when A represents N, then T T T T T in which: V V T in which: W ω to represents:  with R  or W or alternatively the substituents T this process comprising placing in contact: at least one salt of formula (III):  in which: A, B, T Z at least one precursor complex (IV) selected from the group of suitable complexes comprising the complexes of formula: in which M, R 5 , R 6 , R 4 , R 3 , R 1 , R 2 , Y 1 , X and Y 2 are as defined above, for instance: M 2 [CR 5 R 6 ═CR 4 —SiR d R e —O—SiR d R e —CR 3 ═CR 1 R 2 ] 3 , it being understood that M, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R e are as defined above; at least one solvent (V), and at least one base (VI).