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题名: Study on the role of trifluoromethanesulfonate ion in asymmetric cyclopropanation of styrene by in situ. Variable temperature F-19 NMR
作者: Li, C;  Zhang, WP;  Liu, XM;  Yao, XQ;  Lu, SW;  Han, XW;  Bao, XH
关键词: in situ variable temperature F-19 NMR ;  weakly coordinating anion ;  trifluoromethanesulfonate ion ;  styrene ;  cyclopropanation
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2001-03-01
卷: 22, 期:2, 页:154-156
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The role of trifluoromethanesulfonate ion (OTf-) in asymmetric cyclopropanation of styrene catalyzed by ruthenium complex of chiral N, P ligand is investigated by in situ variable temperature F-19 NMR. The temperature of NMR experiment varies from 243 K to 283 K. After ethyl diazoacetate and styrene are added into the catalytic system, the process that the OTf- leaves from the central metal is observed from the change of the F-19 NMR spectra. Owing to the weakly coordinating behavior, trifluoromethanesulfonate ion can be easily removed from the central metal and replaced by substrates to form the reactive intermediate during the reaction. So that the catalytic reactivity can be improved greatly when the silver trifluoromethanesulfonate is added to the catalytic system.
关键词[WOS]: COMPLEXES ;  CATALYSTS ;  KETONES ;  ANIONS ;  LIGAND
语种: 英语
WOS记录号: WOS:000170359000014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138946
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Li, C,Zhang, WP,Liu, XM,et al. Study on the role of trifluoromethanesulfonate ion in asymmetric cyclopropanation of styrene by in situ. Variable temperature F-19 NMR[J]. CHINESE JOURNAL OF CATALYSIS,2001,22(2):154-156.
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