Abstract
Pentacoordinated Mn–salen complexes 1 and 5 possessing an internal pyridine or N-methylimidazole ligand, respectively, were found to be efficient catalysts for asymmetric epoxidation of conjugated Z-olefins using aqueous hydrogen peroxide. In particular, the epoxidation of chromene derivatives proceeded with high enantioselectivity greater than or equal to 97% ee.
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