Carbonylation catalyst system

摘要

A catalyst system, which comprises a) a source of a Group VIII metal, and b) a phosphine of general formula: in which R<1>, R<2> and R<3> are independently selected from an optionally substituted aryl group and a group of general formula: wherein each of A, X, Y and Z is independently selected from a nitrogen atom, a CH group and a group of formula CR wherein R represents a hydroxyl group, an amino group, an amido group, a cyano group, an aryl group, an aryloxy group, a halogen atom, an optionally substituted hydrocarbyl group or an optionally substituted hydrocarbyloxy group, it also being possible for two adjacent CR groups to form a ring, provided that at least one of R<1>, R<2> and R<3> represents a group of formula (II) in which at least one of A and Z represents a group of formula CR; or an acid addition salt thereof. Also disclosed are novel phosphines, and the use of the catalyst system in the selective carbonylation of unsaturated hydrocarbons.