Iron(II) efficiency: The iron complexes of N(4) ligands, derived from proline and benzimidazole, exhibited an unprecedented activity and enantioselectivity for the epoxidation of a variety of di- and trisubstituted enones (see scheme). This system, based on synthetic non-heme iron catalysts, provides ready access to a wide range of epoxyketones of high enantiomeric purity.
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Wang et al. (2012) studied this question.
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