Patent ID: 6156934
Filing Date: 2000-12-05
Classification: B01J,C07C,C07F

Abstract:
A diphosphine of the following formulaR.sup.1 >P-R.sup.2 -PR.sup.3 R.sup.4wherein R.sup.2 represents a covalent bridging group, R.sup.1 represents a bivalent radical that together with the phosphorus atom to which it is attached comprises an optionally substituted 6-phosphatricyclo[3.3.1.1{3,7}]decyl group or a derivative thereof in which one or more of the carbon atoms are replaced by oxygen or sulphur atoms, and wherein R.sup.3 and R.sup.4 independently represent univalent or bivalent, optionally substituted, hydrocarbyl groups or hetero hydrocarbyl groups of up to 20 atoms.