Immobilized chiral Mn (III) salen-containing onium salt onto ZnPS-PVPA for asymmetric epoxidation of unfunctionalized olefins

• The chiral salen Mn(III) was immobilized onto ZnPS-PVPA modified by onium salt.
• The catalysts indicated superior activity in the absence of NMO or imidazole.
• The catalysts could be reused nine times without significant loss of activity.
• The catalysts could be applied in large-scale reactions.

A series of chiral Mn (III) salen are anchored on ZnPS-PVPA modified by onium salt and characterized. In the asymmetric epoxidation of unfunctionalized olefins with m-CPBA and NaIO4 as oxidants, the supported catalysts demonstrate higher catalytic activities than those of the corresponding homogeneous chiral Mn (III) salen catalyst under the same conditions both for experimental scale and for large-scale reactions. Moreover, the catalysts are stable could be recycled nine times without significant loss of activity, which are provided with the potentiality for application in industry.

Graphic abstractThe catalysts immobilized salen Mn (III) onto ZnPS-PVPA displayed superior catalytic ability both for experimental scale and for large-scale reactions.Figure optionsDownload as PowerPoint slide