High to moderate enantiomeric excesses were achieved for the reduction of ketones with catecholborane in the presence of a titanium-based catalyst bearing the new optically active diols 1 a or 1 b as ligands. Of particular interest is the relatively high enantiomeric excess obtained in the reductions of linear nonaromatic methyl ketones.
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Almqvist et al. (1997) studied this question.
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