4340-77-6Relevant articles and documents
Manganese Catalyzed Hydrogenation of Azo (N=N) Bonds to Amines
Ben-David, Yehoshoa,Das, Uttam Kumar,Diskin-Posner, Yael,Kar, Sayan,Milstein, David
, p. 3744 - 3749 (2021/07/09)
We report the first example of homogeneously catalyzed hydrogenation of the N=N bond of azo compounds using a complex of an earth-abundant-metal. The hydrogenation reaction is catalyzed by a manganese pincer complex, proceeds under mild conditions, and yields amines, which makes this methodology a sustainable alternative route for the conversion of azo compounds. A plausible mechanism involving metal-ligand cooperation and hydrazine intermediacy is proposed based on mechanistic studies. (Figure presented.).
Hydrogen peroxide based oxidation of hydrazines using HBr catalyst
Du, Wanting,Ma, Zichao,Shao, Liming,Wang, Jian
, (2021/11/18)
Azo compounds (RN = NR′) are an important class of organic molecules that find wide application in organic synthesis. Herein, we report an efficient, practical and metal-free oxidation of hydrazines (RNH-NHR’) to azo compounds using 5 mol% HBr and hydrogen peroxide as terminal oxidant. This new method has been demonstrated by 40 examples with excellent yields. In addition, we showcased two examples of the one-pot sequential reactions involving our hydrazine oxidation/hydrolysis/Heck reaction or Cu-catalyzed N-arylation with aryl boronic acid. The distinct advantages of this protocol include metal-free catalysis, waste prevention, and easy operation.
Synthesis of Unsymmetrical Azoxyarenes via Copper-Catalyzed Aerobic Oxidative Dehydrogenative Coupling of Anilines with Nitrosoarenes
Shi, Chongyang,Xu, Boxia,Fang, Xiaolan,Yu, Xiaochun,Jin, Huile,Wang, Shun
supporting information, p. 1963 - 1967 (2021/03/04)
A copper-catalyzed oxidative dehydrogenative coupling of nitrosobenzenes with anilines for the synthesis of unsymmetrical azoxybenzenes was developed. This approach uses O2 as the oxidant. The reaction products are diverse unsymmetrical azoxybe