Abstract

The degree of enantioselection by second-generation Mn–salen complexes was found to depend upon the conformation of their ligand and substrate nucleophilicity. Oxidation of usual olefins was better effected by using ( R, S)-Mn–salen complexes as catalysts, while that of more nucleophilic ones was achieved by using ( R, R)-Mn–salen complexes. This phenomenon was explained by analyzing the enthalpy and entropy factors of the reactions.

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