Formation of Three-Membered Rings by S<sub>H</sub>i Displacement. Reverse of Cyclopropyl Ring Opening<sup>1</sup>
作者:Dennis D. Tanner、Liying Zhang、Li Qing Hu、Pramod Kandanarachchi
DOI:10.1021/jo960879u
日期:1996.1.1
carried out in the presence of several transfer agents (CCl(4), CCl(3)Br, CCl(2)Br(2)) initiate a radical chain addition of CCl(2)X(*) and yield cyclized materials resulting from the S(H)i displacement of halogen by a carbon-centered radical. The radical displacement of a halogen on carbon, the reverse of homolyticdisplacement on cyclopropyl carbon, is dominant at low temperatures. The rate constants for
PEG400-enhanced synthesis of gem-dichloroaziridines and gem-dichlorocyclopropanes via in situ generated dichlorocarbene
作者:Qing-Wen Song、Bing Yu、An-Hua Liu、Ying He、Zhen-Zhen Yang、Zhen-Feng Diao、Qing-Chuan Song、Xue-Dong Li、Liang-Nian He
DOI:10.1039/c3ra43307b
日期:——
efficient phase transfer catalyst for the cycloaddition reaction of imines with dichlorocarbene, which is generated in situ from chloroform and sodium hydroxide, to give gem-dichloroaziridines in moderate to excellent yields at ambient temperature. This protocol is also extended to the synthesis of cyclopropanes from a variety of alkenes. In this study, PEG400 behaves as a phase transferreagent thanks to
A New Phase Transfer Reagent for the Addition of Dichlorocarbene to Olefins Under Mild PTC Conditions
作者:J. Paul Jayachandran、Maw-Ling Wang
DOI:10.1080/00397919908085884
日期:1999.12.1
to a novel water soluble phase transfer reagent, Diquat (Dq-Br), viz., 2-benzilidine- N,N,N,N',N',N'- hexaethyl propane-1,3 diammonium dibromide and its utility in various dichlorocarbenations to olefins are described.
Photoreductive Dehalogenation of Organic Halides in the Presence of Lithium Aluminum Hydride
作者:Nobujiro Shimizu、Kenji Watanabe、Yuho Tsuno
DOI:10.1246/bcsj.57.885
日期:1984.3
Lithium aluminum hydride markedly accelerates photoreductive dehalogenation of cyclopropyl, aromatic, and olefinic halides carried out in ether.
氢化铝锂显着加速环丙基、芳族和烯属卤化物在醚中进行的光还原脱卤。
gem-dichloro(alkyl)cyclopropanes in reactions with NOCl·2SO3: Synthesis of alkyl-5-chloroisoxazoles
作者:N. V. Zyk、O. B. Bondarenko、A. Yu. Gavrilova、A. O. Chizhov、N. S. Zefirov
DOI:10.1007/s11172-011-0053-7
日期:2011.2
Nitrosation of gem-dichloro(alkyl)cyclopropanes with the complex NOCl·2SO3 gave regioisomeric alkyl-5-chloroisoxazoles in high yields; a similar reaction with 1,2-bis(gem-dichlorocyclopropyl)ethane afforded the corresponding bis(5-chloroisoxazoles). The reactivities of gem-dichlorobicyclo[n.1.0]alkanes depend on their spatial structures, sharply decreasing with an increase in the number of the methylene units in the bicyclic molecule.