Patent ID: 6156936
Filing Date: 2000-12-05
Classification: C07C

Abstract:
A process for the hydroformylation of a feed comprising compounds having a single ethylenically unsaturated group by reaction thereof in the liquid phase with carbon monoxide and hydrogen; in the presence of a catalyst system comprising:a) a source of palladium cations;b) a source of anions;c) a source of at least one bidentate ligands of the formulaR.sup.1 R.sup.2 M.sup.1 RM.sup.2 R.sup.3 R.sup.4 (I)wherein M.sup.1 and M.sup.2 independently represent a phosphorus, arsenic or antimony atom, R represents a bivalent bridging group containing from 1-4 carbon atoms, optionally also one or more of Si, N, or P, in the bridge, R.sup.1 and R.sup.2 independently represent a substituted or unsubstituted hydrocarbyl group, or together represent a bivalent substituted or unsubstituted cyclic group whereby the two free valencies are linked to M.sup.1, and R.sup.3 and R.sup.4 independently represent a substituted or unsubstituted hydrocarbyl group, or together represent a bivalent substituted or unsubstituted cyclic group whereby the two free valencies are linked M.sup.1, and R.sup.3 and R.sup.4 independently represent a substituted or unsubstituted hydrocarbyl group, or together represent a bivalent substituted or unsubstituted cyclic group whereby the two free valencies are linked to M.sup.2 ; andd) a source of halide chosen from the group of chloride, iodide and bromide and mixtures thereof; characterized in that the ethylenically unsaturated feed comprises one or more dienes and/or further multiply ethylenically unsaturated alkenes to a total amount of 0.005-10 wt % based on the total amount of ethylenically unsaturated compounds in the feed, and in that component b) of the catalyst system is a source of anions of an acid having a pKa value, measured in aqueous solution at 18.degree. C., of between -1 and 4 and wherein said source of anions b) is an acid according to the formula: RXO.sub.3 H.sub.2 (II), wherein X represents phosphorus, arsenic or antimony and R represents a substituted or unsubstituted alkyl or aryl group, or OH, or a salt thereof.