Patent ID: 6737542
Filing Date: 2004-05-18
Classification: C07C

Abstract:
A process for the carbonylation of conjugated dienes, whereby a conjugated diene is reacted with carbon monoxide and a hydroxyl group containing compound selected from the group consisting of alkanols and alkane diols in the presence of a catalyst system including:(a) a palladium salt, (b) a phosphorus-containing ligand, (c) a protonic acid having a pKa value of greater than 1, wherein the phosphorus-containing ligand is a ligand having the general formula I X1â€”Râ€”X2â€ƒâ€ƒ(I) wherein X1 and X2 represent a substituted or non-substituted cyclic group with at least 5 ring atoms, of which one is a phosphorus atom and the rest are carbon atoms, wherein the substitution, if any, is provided by one or more hydrocarbyl groups containing carbon atoms and/or hetero atoms, and R represents a bivalent organic bridging group, connecting both phosphorus atoms, containing 2 or 3 carbon atoms in the bridge; and wherein the molar ratio of conjugated diene to palladium cation is at least 300:1.