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Issue 6, 2016
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A recyclable Mn–porphyrin catalyst for enantioselective epoxidation of unfunctionalized olefins using molecular dioxygen

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Abstract

A magnetically separable chiral catalyst, Fe3O4/tart/Mn(TCPP)Cl, was prepared by the synthesis and immobilization of manganese–tetra(4-carboxyphenyl)porphyrin, Mn(TCPP)Cl, onto the chiral surface of magnetite nanoparticles (Fe3O4/tart-NPs; tart = L-tartaric acid) through the carboxylate groups. The solid catalyst was characterized by a variety of methods including XRD, FE-SEM, FT-IR and UV-Vis spectroscopy. The catalytic activity was tested in the epoxidation reactions of prochiral olefins with molecular oxygen. The reactions were carried out in acetonitrile as solvent with molecular oxygen in the presence of isobutyraldehyde as the stoichiometric oxidant. The catalyst showed consistently high conversion, selectivity and enantioselectivity to epoxide formation in the oxidation of a variety of terminal, cyclic and aromatic olefins. The catalyst showed little deactivation with time and it is easily recovered by magnetic filtration and could be reused four times with little or no loss in activity and selectivity.

Graphical abstract: A recyclable Mn–porphyrin catalyst for enantioselective epoxidation of unfunctionalized olefins using molecular dioxygen

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Supplementary files

Article information


Submitted
14 Mar 2016
Accepted
21 Mar 2016
First published
22 Mar 2016

New J. Chem., 2016,40, 5032-5043
Article type
Paper

A recyclable Mn–porphyrin catalyst for enantioselective epoxidation of unfunctionalized olefins using molecular dioxygen

A. Farokhi and H. Hosseini-Monfared, New J. Chem., 2016, 40, 5032
DOI: 10.1039/C6NJ00808A

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