Patent ID: 7538228

Claim:
A chiral ligand selected from the group consisting of compounds represented by the following formulas and their enantiomers: where x is PR 2 ; wherein each R is independently selected from the group consisting of: linear, branched or cyclic alkyl, linear, branched or cyclic substituted alkyl, aryl, and substituted aryl, and a hetereocyclic group; wherein Y is selected from the group consisting of: linear, branched or cyclic alkyl, linear, branched or cyclic substituted alkyl, aryl, and substituted aryl, ferrocene, substituted ferrocene, a hetereocyclic group, and a hetereoaromatic group; A is a substituent on the aromatic ring selected from the group consisting of: hydrogen, halide, alkoxyl, carboxylates, linear, branched or cyclic alkyl, aryl, and a substituted aryl group; and Z is selected from the group consisting of: oxygen sulfur, NH, NR, and CH 2 .