A New Chiral Rhodium(I) Complex of (2R,3R)‐2,3‐Bis(diphenylphosphino)butane for Asymmetric Hydrogenations Rhodium(I) complexes of the new chiral ligand (2R,3R)‐2,3‐bis(diphenylphosphino)butane (4) — which is easily prepared from natural tartaric acid — hydrogenate α‐(acylamino)acrylic acids to natural (S)‐acylamino acids in high chemical (95 – 100%) and optical (80 – 100%) yields.
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Köttner et al. (1980) studied this question.
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