The asymmetric hydrogenation of α-acylaminocinnamic acids with the rhodium complex of (1R, 2R)-1, 2-bis (N-diphenylphosphino-N-methylamino) cyclohexane has been reported to give preferentially (S)-amino acids. On the contrary, it has been found that the enantiomeric (R)-amino acids are obtained by hydrogenation with the rhodium complex of (1R, 2R)-1, 2- bis (diphenylphosphinamino) cyclohexane. The study of the inversion of the ...