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Efficient catalysis of asymmetric hydrogenations is possible with complexes of the type 1 which contain chiral diphosphites as ligands. Thus the Rh-catalyzed hydrogenation of dimethyl itaconate with a catalyst containing 1,4:3,6-dianhydro-D-mannite and conformationally enantiomeric diols is highly enantioselective.
Reetz et al. (Fri,) studied this question.