A Mononuclear Manganese Complex of a Tetradentate Nitrogen Ligand – Synthesis, Characterizations, and Application in the Asymmetric Epoxidation of Olefins
作者： Duyi Shen , Chengxia Miao , Shoufeng Wang , Chungu Xia , Wei Sun
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摘要: A new chiral manganese complex (C1) bearing a tetradentate nitrogen ligand containing bipyrrolidine and benzimidazole moieties was prepared. The structure of C1 confirmed by ESI-MS crystallography. This is an active catalyst for the asymmetric epoxidation various olefins with excellent conversion (up to 99 %) high enantiomeric excess 96 % ee) hydrogen peroxide as oxidant in presence 2-ethylhexanoic acid or acetic acid. Compared previous structurally similar complexes different diamine backbones (C2, cyclohexanediamine; C3, from L-proline), showed improved induction, especially simple such styrene derivatives substituted chromene. possible reasons improvement ee values are discussed text on basis crystal structures complexes.
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