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Chiral polythioureas have been synthesized and tested in asymmetric hydride transfer reduction of ketones with ruthenium. With polyurea 18, 70% ee was attained for acetophenone reduction; after filtration, it can be reused at least four times without any detectable loss of activity and only a slight decrease in selectivity. Various aryl alkyl ketones were reduced with the same system and up to 84% ee was measured with isopropyl phenyl ketone.
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