A novel strategy for the dehydrogenation of the NH−NH bond is disclosed using potassium tert‐butoxide (tBuOK) in liquid ammonia (NH3) under air at room temperature. Its synthetic value is well demonstrated by the highly efficient synthesis of aromatic azo compounds (up to 100 % yield, 3 min), heterocyclic azo compounds, and dehydrazination of phenylhydrazine. The broad application of this strategy
Visible-light-promoted oxidative dehydrogenation of hydrazobenzenes and transfer hydrogenation of azobenzenes
作者:Xianya Wang、Xianjin Wang、Chungu Xia、Lipeng Wu
DOI:10.1039/c9gc01618j
日期:——
synthesize azo compounds from hydrazine derivatives. The use of visible-light with air as the oxidant makes this process sustainable and practical. Moreover, the visible-light-driven, photo-redox-catalyzed transfer hydrogenation of azobenzenes is compatible with a series of hydrogen donors such as phenyl hydrazine and cyclic amines. Compared with traditional (thermal/transition-metal) methods, our process avoids
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.