Patent ID: 6232262
Filing Date: 2001-05-15
Classification: B01J,C07C,C07F

Abstract:
A catalyst system comprising a palladium compound, a protonic acid compound having a pKa between 2-6 measured in water of 18.degree. C., and a non-symmetrical bidentate phosphorous ligand represented by the formula: ##STR3##wherein the --PR.sup.1 R.sup.2 group is different from the PR.sup.3 R.sup.4 group, in which at least one of R.sup.1 and R.sup.2 is an electron-withdrawing group and at least one R.sup.3 and R.sup.4 is an electron-donating group, X is a divalent organic bridging group, in which the shortest direct link between the two phosphorous atoms in the bridging group X consists of a chain of 2-10 carbon atoms and optionally a sulphur or oxygen atom.