我们报告了一种使用安德森型多氧钼酸铁 ( III ) 作为催化剂和过氧化氢作为氧化剂在乙醇水溶液中氧化脱氢肼和二芳基胺的有效方法。以中等至极好的收率获得了一系列偶氮化合物和四芳基肼。反应条件和底物范围补充或优于更成熟的方案。此外,该催化剂在水中表现出良好的稳定性和重复使用性。初步的机理研究表明,该反应涉及一个自由基过程。
Electrosynthesis of Azobenzenes Directly from Nitrobenzenes
作者:Yanfeng Ma、Shanghui Wu、Shuxin Jiang、Fuhong Xiao、Guo‐Jun Deng
DOI:10.1002/cjoc.202100470
日期:2021.12
The electrochemical reduction strategy of nitrobenzenes is developed. The chemistry occurs under ambient conditions. The protocol uses inert electrodes and the solvent, DMSO, plays a dual role as a reducing agent. Its synthetic value has been demonstrated by the highly efficient synthesis of symmetric, unsymmetric and cyclic azo compounds.
Zr(OH)
<sub>4</sub>
‐Catalyzed Controllable Selective Oxidation of Anilines to Azoxybenzenes, Azobenzenes and Nitrosobenzenes
作者:Jiaheng Qin、Yu Long、Fangkun Sun、Pan‐Pan Zhou、Wei David Wang、Nan Luo、Jiantai Ma
DOI:10.1002/anie.202112907
日期:2022.1.10
Zr(OH)4 can catalyze the selective oxidation of anilines to azoxybenzenes, symmetric/unsymmetric azobenzenes and nitrosobenzenes for a wide range of substrates. Control experiments and DFT calculations reveal that the activation of H2O2 and O2 can be attributed to the bridging hydroxyl and terminal hydroxyl groups of Zr(OH)4, respectively.
Zr(OH) 4可以催化苯胺选择性氧化为偶氮苯、对称/不对称偶氮苯和亚硝基苯,适用于多种底物。对照实验和 DFT 计算表明,H 2 O 2和 O 2的活化可分别归因于 Zr(OH) 4的桥接羟基和末端羟基。
Preparation of Diazenes by Electrophilic C-Coupling Reactions of Dry Arenediazonium o-Benzenedisulfonimides with Grignard Reagents