The Photochemical Reduction of Nitrobenzene and Its Reduction Intermediates. XI. The Photochemical Reduction of Azobenzene in Isopropyl Alcohol
作者:Shizunobu Hashimoto、Koji Kano
DOI:10.1246/bcsj.45.852
日期:1972.3
The photochemical reduction of azobenzene in isopropylalcohol has been investigated. The n-π* transition of azobenzene caused only the cis-trans photoisomerization, while the n-π* transition caused both photoisomerization and photoreduction. The reduction product was hydrazobenzene. The photoreduction was accelerated by a small amount of oxygen and was quenched by 1,3-pentadiene. The photoreduction
Visible-Light-Promoted Hydrogenation of Azobenzenes to Hydrazobenzenes with Thioacetic Acid as the Reductant
作者:Qiao Li、Yanshu Luo、Jianhui Chen、Yuanzhi Xia
DOI:10.1021/acs.joc.2c02873
日期:2023.2.17
A catalyst- and metal-free hydrogenation of azobenzenes to hydrazobenzenes in the presence of thioaceticacid was achieved under visible light irradiation. The transformation was carried out under mild conditions in an air atmosphere at ambient temperature, generating a variety of hydrazobenzenes with yields up to 99%. The current process is compatible with a variety of substituents and is highly chemoselective
<i>N</i>,<i>N</i>-Diisopropylethylamine-Mediated Electrochemical Reduction of Azobenzenes in Dichloromethane
作者:Hongyan Zhou、Rundong Fan、Jingya Yang、Ximei Sun、Xiaojun Liu、Xi-Cun Wang
DOI:10.1021/acs.joc.2c01949
日期:2022.11.4
report a cathodic reduction-dominated electrochemical approach for the hydrogenation of azobenzenes in dichloromethane. With cheap and readily available N,N-diisopropylethylamine as a catalytic mediator, the reaction proceeded smoothly in a simple undivided cell under constant-current electrolysis. A series of azobenzenes were successfully reduced to the corresponding hydrazobenzenes in moderate to high
The search for efficient molecular hydrogenprecursors and their catalytic exploration is necessary for the evolution of catalytic transfer hydrogenation. Methyl formate (MF) having high hydrogen content still remains unexplored for such transformations. Herein, we disclosed a bifunctional Ir(III)-complex catalyzed chemoselective TH protocol for N-heteroarenes and azoarenes using MF. A variety of substrates
cascade O-sulfination and desulfurdioxidative N−N coupling (via stepwise retro-[2π+2σ] cycloaddition, supported by quantum chemistry calculations) from readily available N-arylhydroxylamines and N-sulfinylanilines under metal and oxidant free conditions.