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Ask a copper: A copper(II) salt/chiral dipyridylphosphine/PhSiH(3) system (see scheme) acts as a very effective and practical catalyst for the asymmetric reduction of heteroaromatic and other types of ketones in air with good-to-excellent enantioselectivities (up to 94%), giving many chiral alcohols that are intermediates for physiologically active compounds. Remarkable temperature effects were observed for some heteroaromatic ketones.
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Zhang et al. (2009) studied this question.
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