Patent ID: 6919456

Claim:
A chiral ligand of formula I: where R 1 -R 4 are aryl groups, which may be the same or different, each of which is unsubstituted or substituted with one or more substituents X, where each X is independently selected from alkyl, alkenyl, alkynyl, aryl, aralkyl, aralkenyl, aralkynyl, alkoxy, aryloxy, amide, alkyl- or aryl sulfonyl, sulfonamide, hydroxy, cyano, nitro, and halogen, wherein R 1 and R 2 , or R 3 and R 4 , or both of these combinations, may be linked at an α-carbon of each said group to form a tricyclic or larger ring system; m is an integer from 0 to 3; each of R 5 and R 6 represents one or more substituents independently selected from the group consisting of hydrogen and X as defined above; and R 7 represents one or more substituents on the phenol ring independently selected from the group consisting of hydrogen, X as defined above, and a further fused ring.