Carbonylation catalyst system.

摘要

The invention relates to a catalyst system, which comprises a) a source of a Group VIII metal, and b) a polyphosphine of general formula: <CHEM> in which each R is independently selected from an optionally substituted alkyl, cycloalkyl, aryl or heteroaryl group; and each of A, X and Z is independently selected from a nitrogen atom, a CH group, a group of formula C-PR2 with R being defined as hereinbefore, and a group of formula CR', wherein R' represents a hydroxyl group, an amino group, an amido group, a cyano group, an acyl group, an acyloxy group, a halogen atom, an optionally substituted hydrocarbyl group, an optionally substituted heteroaryl group or an optionally substituted hydrocarbyloxy group, it also being possible for two adjacent CR' groups to form a ring; or an acid addition salt thereof. The invention further relates to the use of this catalyst system in the carbonylation of unsaturated compounds.