Patent ID: 7105702

Claim:
A chiral ligand represented by the following formula or its enantiomer: wherein X is a divalent group selected from the group consisting of: (CR 4 R 5 ) n and (CR 4 R 5 ) n —Z—(CR 4 R 5 ) n , wherein each n is independently an integer from 1 to 6; wherein each R 4 and R 5 is independently selected from the group consisting of: hydrogen, alkyl, aryl, substituted alkyl, substituted aryl, halogen, hydroxy, alkoxy, aryloxy, alkylthio and amido; and wherein Z is selected from the group consisting of: PR′ wherein each R′ is independently selected from the group consisting of: hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, hydroxy, alkoxy, aryloxy, acyl and alkoxycarbonyl; wherein R is selected from the group consisting of: alkyl, aryl, substituted alkyl, substituted aryl, alkoxy and aryloxy; wherein E is selected from the group consisting of: PR′ 2 , CH 2 PR′ 2 , and a group represented by the formula: wherein Y is selected from the group consisting of: (CR 4 R 5 ) m and (CR 4 R 5 ) m —Z—(CR 4 R 5 ) m ; wherein each m is independently an integer from 0 to 3; wherein each R 4 and R 5 is independently selected from the group consisting of: hydrogen, alkyl, aryl, substituted alkyl, substituted aryl, halogen, hydroxy, alkoxy, aryloxy, alkylthio, and amido; and wherein Z is selected from the group consisting of: PR′ wherein each R′ is independently selected from the group consisting of: hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, hydroxy, alkoxy, aryloxy, acyl and alkoxycarbonyl.