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。
A new and readily available bidentate ligand, namely, pyrrolidine-2-phosphonicacidphenylmonoester (PPAPM), has been developed for the copper-catalyzedformation of C-N, C-O, and P-C bonds, and various N-, O-, and P-arylation products were synthesized in good to excellent yields by using the CuI/PPAPM catalyst system. Addition of the PPAPM ligand greatly increases the reactivity of the copper catalyst
Photocatalyzed oxidative dehydrogenation of hydrazobenzenes to azobenzenes
作者:Haiping Lv、Ronibala Devi Laishram、Jiayan Li、Yongyun Zhou、Dandan Xu、Sagar More、Yuze Dai、Baomin Fan
DOI:10.1039/c9gc01235d
日期:——
Visible light mediated oxidativedehydrogenation of hydrazobenzenes under an ambient atmosphere using an organic dye as a photocatalyst was reported for the first time. The reaction provides an environmentally benign method for the preparation of azobenzenes in excellent yields with good functional group tolerance.
A metal-free direct oxidative dehydrogenation approach for the synthesis of azobenzenesfrom hydrazobenzenes has been developed by using TEMPO as an organocatalyst for the first time. The reaction proceeded in open air under mild reaction conditions. A wide range of hydrazobenzenes readily undergo dehydrogenation to give the corresponding azobenzenes in excellent yields.
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