A novel chiral phosphinediamine ligand (PN2) was prepared from (S)-1-phenylethylamine and dichloroisopropylphosphine. The rhodium-PN2 catalyst utilizing selective ligation of the amino unit and electrostatic interaction between the ligand and a substrate gave high enantioselectivities up to 92% ee in asymmetric hydrogenations of acrylic acid derivatives. Copyright (C) 1996 Elsevier Science Ltd
Yamada, Issaku; Ohkouchi, Munetaka; Yamaguchi, Motowo, Journal of the Chemical Society. Perkin transactions I, 1997, # 12, p. 1869 - 1873