A role of ionic liquid as an activator for efficient olefin epoxidation catalyzed by polyoxometalate

doi:10.1039/b710444h

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	A role of ionic liquid as an activator for efficient olefin epoxidation catalyzed by polyoxometalate
	Liu, Lili 1; Chen, Chuncheng 1; Hu, Xuefeng 1; Mohamood, Tariq 1; Ma, Wanhong 1; Lin, Jun 2; Zhao, Jincai 1
刊名	NEW JOURNAL OF CHEMISTRY
	2008
卷号	32 期号:2 页码:283-289
ISSN号	1144-0546
DOI	10.1039/b710444h
英文摘要	Ionic liquid (IL), such as 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]), as an activator for the epoxidation of a wide variety of olefins with H2O2 catalyzed by Keggin polyoxometalate [bmim](3)PW12O40 has been demonstrated. Use of IL results both in significant enhancement of TOF and selectivity for olefin epoxidation compared to that of traditional organic solvents, e. g. 289 times TOF and 1.3 times selectivity as found in CH2Cl2 for the epoxidation of cis-cyclooctene. The kinetic P-31 NMR spectra uncover that the active peroxotungstate [PO4{W(O)(O)(2)}(4)](3-) (Venturello complex), contributing to the epoxidation, can be readily generated in the presence of [bmim][PF6]. Furthermore, the counterion such as PF6- and [(CF3SO2)(2)N](-) is evidenced to play a crucial role in the epoxidation of olefin. BF4- as counterion, instead of PF6-, is found to reduce TOF and selectivity for cis-cyclooctene epoxidation dramatically from 289 to less than 1 and from 99% to 12%, respectively.
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000253014300012
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/63887]
专题	中国科学院化学研究所
通讯作者	Zhao, Jincai
作者单位	1.Chinese Acad Sci, Inst Chem, Natl Lab Mol Sci, Key Lab Photochem, Beijing 100080, Peoples R China 2.Renmin Univ China, Dept Chem, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Liu, Lili,Chen, Chuncheng,Hu, Xuefeng,et al. A role of ionic liquid as an activator for efficient olefin epoxidation catalyzed by polyoxometalate[J]. NEW JOURNAL OF CHEMISTRY,2008,32(2):283-289.
APA	Liu, Lili.,Chen, Chuncheng.,Hu, Xuefeng.,Mohamood, Tariq.,Ma, Wanhong.,...&Zhao, Jincai.(2008).A role of ionic liquid as an activator for efficient olefin epoxidation catalyzed by polyoxometalate.NEW JOURNAL OF CHEMISTRY,32(2),283-289.
MLA	Liu, Lili,et al."A role of ionic liquid as an activator for efficient olefin epoxidation catalyzed by polyoxometalate".NEW JOURNAL OF CHEMISTRY 32.2(2008):283-289.