期刊
NEW JOURNAL OF CHEMISTRY
卷 40, 期 6, 页码 5032-5043出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nj00808a
关键词
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资金
- University of Zanjan
- Iran National Science Foundation [INSF 92036382]
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.
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