Photocatalyst size controls electron and energy transfer: selectable E/Z isomer synthesis via C–F alkenylation
作者:A. Singh、C. J. Fennell、J. D. Weaver
DOI:10.1039/c6sc02422j
日期:——
Photocatalytic alkene synthesis can involve electron and energy transfer processes. The structure of the photocatalyst can be used to control the rate of the energy transfer, providing a mechanistic handle...
A transition‐metal‐free catalytic hydrodefluorination (HDF) reaction of polyfluoroarenes is described. The reaction involves direct hydride transfer from a hydrosilicate as the key intermediate, which is generated from a hydrosilane and a fluoride salt. The eliminated fluoride regenerates the hydrosilicate to complete the catalytic cycle. Dispersion‐corrected DFT calculations indicated that the HDF
描述了多氟芳烃的无过渡金属催化加氢脱氟(HDF)反应。该反应涉及从氢硅酸盐作为主要中间体的氢化物直接转移,这是由氢硅烷和氟化物盐生成的。除去的氟化物使氢硅酸盐再生,从而完成催化循环。分散校正的DFT计算表明HDF反应通过协调的亲核芳族取代(CS N Ar)过程进行。
Nickel-Catalyzed Alkenylation and Alkylation of Fluoroarenes via Activation of C−H Bond over C−F Bond
作者:Yoshiaki Nakao、Natsuko Kashihara、Kyalo Stephen Kanyiva、Tamejiro Hiyama
DOI:10.1021/ja807258m
日期:2008.12.3
Nickel/P(c-C(5)H(9))(3) (PCyp(3)) catalyst effects the addition reactions of fluoroarenes across alkynes, 1,3-dienes, and vinylarenes via the activation of C-H bonds over C-F bonds. The acidic C-H bonds located ortho to fluorine are exclusively activated to afford a range of alkenylated and alkylated fluoroarenes.
Hydrofluoroarylation of alkynes with fluoroarenes
作者:Kyalo Stephen Kanyiva、Natsuko Kashihara、Yoshiaki Nakao、Tamejiro Hiyama、Masato Ohashi、Sensuke Ogoshi
DOI:10.1039/c0dt00104j
日期:——
of both alkynes and fluoroarenes containing both electron-withdrawing and -donating groups, thus allowing efficient synthesis of a variety of substituted ethenes containing a fluoroaryl motif in high regio- and stereoselective manners. Mechanistic studies including both labeling experiments and stoichiometric reactions reveal that oxidativeaddition of C–H bonds in fluoroarenes to nickel(0) is kinetically