Cross-dimerization of olefins

Details Cross-dimerization of olefins Cross-dimerization of olefins

C - Chemistry, Metallurgy

07

C

C07C 67/347 (2006.01) C07C 69/533 (2006.01)

Patent

CA 2269573

Disclosed is a process for the production of chemical intermediates by the cross dimerization of two compounds containing carbon-carbon double bonds, wherein said process is catalyzed by a nickel II catalyst which is a complex with ??3¿ carbon-based allyl or substituted allyl, trisubstituted phosphine, and a weakly coodinating ligand. This catalyst may be used to selectively cross-dimerizes ethylene and methyl acrylate to give methyl 4-pentenoate, a nylon 6,6 intermediate.

L'invention a trait à un procédé de production d'intermédiaires de substances chimiques faisant intervenir une dimérisation croisée de deux composés contenant des liaisons doubles carbone-carbone. Une catalyse intervient dans ce procédé, le catalyseur étant un catalyseur au nickel II, à savoir un complexe possédant un allyle à base de carbone eta <3> ou un allyle substitué, un hydrogène phosphoré trisubstitué et un ligand à faible pouvoir de coordination. On peut utiliser ce catalyseur pour effectuer une dimérisation croisée sélective d'éthylène et d'acrylate de méthyle afin d'obtenir un méthyl 4-penténoate, un intermédiaire de nylon 66.

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