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For instance, one of these ligands, the chelating salen, is known by the ability to significantly decrease the Mn(III)/Mn(II) redox potentials, and the resulting complexes constitute suitable systems to catalyse multiple redox reactions such as asymmetric epoxidation of unfunctionalized olefins, catalase reaction, water photolysis, Diels-Alder cycloaddition, enantioselective cyclopropanation
of styrenes and ring opening of epoxides [1-8].