Patent ID: 6855849

Claim:
A non-C 2 symmetric bisphosphine ligand comprising an achiral phosphine group, a chiral phosphine group, and a bridge that links the achiral and chiral phosphine groups, the ligand represented by Formula I: or corresponding enantiomers thereof, wherein: the bridge is substituted or unsubstituted C 1-12 alkylene or aryl; the achiral phosphine group is in which R is the same at each occurrence and is isopropyl, tert-butyl, 1,1-dimethylpropyl, 1,1-diethylbutyl, 1,1,3,3-tetramethylbutyl, cyclopentyl, 1-methyl-cyclopentyl, 1-methyl-cyclohexyl, 1-hydroxy-C 5-15 -cycloalkyl, 1-alkoxy-C 5-15 -cycloalkyl, adamantyl, dialkylamino, or diarylamino; and the chiral phosphine group is in which R 5 is isopropyl, tert-butyl, 1,1-dimethylpropyl, 1,1-diethylbutyl, 1,1,3,3-tetramethylbutyl, 1-methyl-cyclopentyl, 1-methyl-cyclohexyl, C 5-15 -cycloalkyl, 1-hydroxy-C 5-15 -cycloalkyl, 1-alkoxy-C 5-15 -cycloalkyl, dialkylamino, or diarylamino; and R 1 is hydrogen, methyl, straight chain alkyl or substituted alkyl of up to twenty carbon atoms, alkoxy or substituted alkoxy of up to twenty carbon atoms, alkylamino, or arylamino, provided that R 1 and R 5 are different.