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CH/π Attraction: The Origin of Enantioselectivity in Transfer Hydrogenation of Aromatic Carbonyl Compounds Catalyzed by Chiral η6-Arene-Ruthenium(II) Complexes


  • This work was financially supported by a Grant-in-Aid for Scientific Research (No. 07CE2004) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.


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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.