Synthesis of new cationic BINAP–ruthenium(II) complexes and their use in asymmetric hydrogenation [BINAP = 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl]

Abstract

Reaction of [RuX₂(arene)]₂(1) and (S)-BINAP gives cationic BINAP–ruthenium complexes of the formula {RuX(arene)[(S)-binap]} Y (2)(X = Cl, Br, and l; Y = Cl, Br, l, BF₄, and BPh₄; arene = C₆H₆ and p-MeC₆H₄CHMe₂) which are efficient catalyst precursors for enantioselective hydrogenation of various prochiral alkenic and ketonic substrates [BINAP = 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl]; a crystal structure of (2)(with X = Cl, Y = BF₄) was obtained.