Carboxy marks the spot: A carboxy-directed asymmetric hydrogenation of 1,1-diarylethenes and 1,1-dialkylethenes with chiral iridium/spiro phosphine–oxazoline catalysts has been developed. A wide range of chiral diarylethanes and chiral γ-methyl fatty acids were synthesized with excellent enantioselectivity (see scheme).
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Song et al. (2012) studied this question.
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