31P NMR STUDIES ON THE MECHANISM OF ASYMMETRIC HYDROGENATION CATALYZED BY RHODIUM(I) COMPLEXES WITH CHIRAL PYRROLIDINODIPHOSPHINE LIGAND. EVIDENCE FOR EXTREMELY REGIOSELECTIVE COMPLEXATION OF PROCHIRAL SUBSTRATES

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Abstract
31P {1H} NMR studies on the key intermediate complex of asymmetric hydrogenation, [(L*–L)Rh(S–S′)]+ClO4− (L*–L = pyrrolidinodiphosphine, BPPM and PPPM; S–S′ = itaconic acid and α-acetamidoacrylic acid), revealed that the mode of the bidentated complexation of the prochiral substrate is extremely regioselective and stereoselective. A possible mechanism for chiral recognition of enantiofaces is proposed.