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The through-space CH/π attraction between the η6-arene ligand on Ru and the carbonyl aryl substituent (see transition states in picture) plays a key role in the enantioselective transfer hydrogenation of aromatic carbonyl compounds with 2-propanol or formic acid, catalyzed by chiral η6-arene–RuII complexes.
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Yamakawa et al. (2001) studied this question.
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