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Very different ligands have been employed recently for enantioselective hydrogenation. With rhodium phospholane complexes, not only the usual, but also highly substituted enamides such as 1 and acylhydrazones can be hydrogenated. With ruthenium complexes containing chiral amino alcohols, ketones can be converted into the corresponding alcohols with high enantioselectivities.
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Albrecht et al. (1996) studied this question.
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