Efficient dehydrocyanation of hindered 1-substituted olefins
摘要:
The chlorosulfides 7 which formed quantitatively by reaction of olefins 5 with PhSCl under neutral conditions could be converted into the unsaturated nitrites 6 in good yields by sequential treatment with alkaline cyanides and MCPBA. a similar result being observed by reversing this order. (C) 2002 Elsevier Science Ltd. All rights reserved.
[EN] PROCESS FOR HYDROCYANATION OF TERMINAL ALKYNES<br/>[FR] PROCÉDÉ D'HYDROCYANATION D'ALCYNES TERMINAUX
申请人:STUDIENGESELLSCHAFT KOHLE MBH
公开号:WO2018210631A1
公开(公告)日:2018-11-22
The present invention refers to a process for a Rh-catalyzed Anti-Markovnikov hydrocyanation of terminal alkynes which process discloses, for the first time, the highly stereo- and regio-selective hydrocyanation of terminal alkynes to furnish E- configured alkenyl nitriles and the catalyst used in the present process.
Rh-Catalyzed Anti-Markovnikov Hydrocyanation of Terminal Alkynes
作者:Fei Ye、Junting Chen、Tobias Ritter
DOI:10.1021/jacs.7b03749
日期:2017.5.31
We report the first highly stereo- and regioselective hydrocyanation of terminal alkynes to furnish E-configured alkenyl nitriles. Acrylonitriles can be accessed on gram scale with broad substrate scope and functional group tolerance. The hydrocyanation reaction employs acetone cyanohydrin as a practical alternative to HCN gas.
我们报告了第一个高度立体和区域选择性的末端炔烃氢氰化反应,以提供 E 构型的烯基腈。丙烯腈可以在克级获得,具有广泛的底物范围和官能团耐受性。氢氰化反应使用丙酮氰醇作为 HCN 气体的实用替代品。
Nickel(0) catalysed additions of hydrogen cyanide to alkynes: stereochemistry, mechanism, and preparative application
作者:W. Roy Jackson、Craig G. Lovel
DOI:10.1039/c39820001231
日期:——
The addition of hydrogen cyanide to both terminal and disubstitutedacetylenes occurs with cis-stereospecificity in moderate to excellent yields when catalysed by a nickel(0) complex.
当被镍(0)络合物催化时,氰化氢加到末端和二取代的乙炔上时,具有顺式-立体特异性,产率中等至极好。
Influence of steric and polar effects in determining the equilibrium position for <i>cis</i>–<i>trans</i>-olefin pairs
作者:D. V. Gardner、D. E. McGreer
DOI:10.1139/v70-349
日期:1970.7.1
substituted by t-butyl or isopropyl groups at the β-position along with methoxyl, thioethoxyl dimethylamino, chloro, and hydrogen at the other β-position have been prepared. Evaluation of the isomer stability from cis-trans equilibrations achieved catalytically or thermally supports earlier observations'that steric and polar factors maintain a strong tendency for a β-methoxyl group to be trans to a nitrile or
Chemoselectivity in the conjugate addition of allylsilane to Michael acceptors
作者:George Majetich、Ada M. Casares、D. Chapman、M. Behnke
DOI:10.1016/s0040-4039(00)81803-1
日期:1983.1
The allylic carbanion species generated by treatment of allylsilane with fluoride ion undergoes highly chemoselective conjugateaddition to a series of Michaelacceptors for which alternative known allylation procedures proved less general.