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

Content Provider	Royal Society of Chemistry (RSC)
Author	Yin, Shenfu Zhang, Yaoyao Zheng, Weiguo Zhao, Guangwu Yin, Donghong Tan, Rong Chen, Yaju
Copyright Year	2015
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.
Starting Page	2092
Ending Page	2102
Page Count	11
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	5
Issue Number	4
Journal	Catalysis Science & Technology
DOI	10.1039/c4cy01290a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Salen ligand Heterogeneous catalysis Indene Graphene Enantiomer Epoxide Styrene Enantiomeric excess Reaction rate Ionic liquid Alpha-Methylstyrene
Content Type	Text
Resource Type	Article
Subject	Catalysis

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