(-)-6,6′-{[(1S,3S)-1,3-Dimethyl-1,3-propanediyl]bis(oxy)}bis[4,8-bis(t-butyl)-2,10-dimethoxy-bibenzo[d,f][1,3,2]dioxaphosphepin] is a chiral phosphine ligand for enantioselective synthesis with high yield and high enantioselective results.