Issue 4, 2015

Ionic liquid-functionalized graphene oxide as an efficient support for the chiral salen Mn(iii) complex in asymmetric epoxidation of unfunctionalized olefins

Abstract

Imidazolium-based ionic liquid (IL)-functionalized graphene oxide (GO) was prepared and used to support chiral salen Mn(III) complexes. Technologies of characterization suggested that the intact chiral complex was covalently appended on flat planes and edge of the GO sheet through an imidazolium-based IL linker. The flexible layer-structure, as well as the active role of the IL linker in overall reaction, makes the novel heterogeneous catalyst efficient and universal for the enantioselective epoxidation of unfunctionalized olefins using NaClO as an oxidant. Remarkable enhancement of the reaction rate with excellent conversion (99%) was observed over a wide range of alkenes (styrene, α-methylstyrene, indene, 1,2-dihydronaphthalene, 6-cyano-2,2-dimethylchromene, and 6-nitro-2,2-dimethylchromene). The enantiomeric excess (ee) for epoxides was also encouraging (in the range of 73–93%), except for styrene (ee, 40%) and α-methylstyrene (ee, 44%). More importantly, the catalyst was perfectly stable and could be reused several times without significant loss of activity and enantioselectivity.

Graphical abstract: Ionic liquid-functionalized graphene oxide as an efficient support for the chiral salen Mn(iii) complex in asymmetric epoxidation of unfunctionalized olefins

Article information

Article type
Paper
Submitted
03 Oct 2014
Accepted
12 Dec 2014
First published
15 Dec 2014

Catal. Sci. Technol., 2015,5, 2092-2102

Author version available

Ionic liquid-functionalized graphene oxide as an efficient support for the chiral salen Mn(III) complex in asymmetric epoxidation of unfunctionalized olefins

W. Zheng, R. Tan, S. Yin, Y. Zhang, G. Zhao, Y. Chen and D. Yin, Catal. Sci. Technol., 2015, 5, 2092 DOI: 10.1039/C4CY01290A

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