Patent ID: 6689915
Filing Date: 2004-02-10
Classification: B01J,C07B,C07F

Abstract:
A non-C2 symmetric bisphosphine ligand having structural formula: wherein the bridge is a 1,2-divalent phenyl, a 1,2-divalent substituted phenyl, or a â€”(CH2)nâ€” in which n is an integer from 1 to 12; the achiral phosphine group is in which R is t-butyl, isopropyl, adamantyl, 1,1-dimethylpropane, 1,1-diethylbutane, or c-C5H9; andthe chiral phosphine group includes a three-coordinated phosphorous atom which is bonded to the bridge and to two carbon atoms, the two carbon atoms and the phosphorus atom not being part of a ring system.