SYNTHESIS AND RESOLUTION OF A NEW TYPE OF CHIRAL BISPHOSPHINE LIGAND, trans-BIS-1,2-(DIPHENYLPHOSPHINO) CYCLOBUTANE, AND ASYMMETRIC HYDROGENATION USING ITS RHODIUM COMPLEX
Oxidative coupling of the 1,4-dicarbanions derived from bis-1,4-(diphenylphosphinyl) butane gave (+/-)-trans-bis-1,2-(diphenyl-phosphinyl) cyclobutane.Asymmetric hydrogenation of dehydroamino acids using rhodium complex of the optically active bisphosphin