Aryliminodimagnesium Reagents. XII. The Distribution of Products in the Condensation with Nitrobenzothiazoles. Reduction of Electron-Donating Ability of Reagent by the Interaction with Thiazolyl Group
作者:Masao Okubo、Keiko Asao、Hiroyuki Hyakutake
DOI:10.1246/bcsj.60.3781
日期:1987.10
The 4-, 5-, 6-, and 7-nitro derivatives of benzothiazole condense with ArN(MgBr)2 giving unsym-azoxy and -azo products. The product distribution indicated the mild nature of the reaction, and could be explained in terms of a reduced electron-donating ability of the reagent due to an interaction with thiazolyl group.
Synthesis of Unsymmetrical Aromatic Azoxy Compounds by Silver‐Mediated Oxidative Coupling of Aromatic Amines with Nitrosoarenes
作者:Weijie Ding、Shengshi Xu、Xiaochun Yu、Shun Wang
DOI:10.1002/adsc.201801175
日期:2019.3.15
A silver(I) oxide‐mediated synthesis of unsymmetrical aromatic azoxy compounds has been successfully achieved, wherein oxidative coupling reactions between aromatic amines and nitrosoarenes take place in ethanol under air. This reaction has very high economic value because silver(I) oxide is the only oxidant required and no other additive is needed. The resulted silver particles can be easily recovered
Aryliminodimagnesium Reagents. IV. The Independent Preparation of Unsymmetrically Substituted Azoxyarene Isomers and Their Deoxygenation
作者:Masao Okubo、K\={o}ji Koga
DOI:10.1246/bcsj.56.203
日期:1983.1
By use of the condensation reaction of aryliminodimagnesium reagents (ArN(MgBr)2) with nitroarenes, six symmetrical and eight unsymmetrical azoxyarenes including four pairs of isomers were prepared in 40–80% yields. The deoxygenation reaction of the azoxyarenes by treating with five molar equivalents of p-MeOC6H4N(MgBr)2 at 55 °C in tetrahydrofuran was also studied, and the reactivity of deoxygenation
Aryliminodimagnesium Reagents. XIX. Effects of Miscellaneous Metal Halides on Oxidative Self-Coupling of the Reagent, and on Its Condensation with Nitrobenzene. A New Preparative Route to<i>o</i>,<i>o</i>′-Dihydroxyazobenzene
作者:Masao Okubo、Haruko Shiku
DOI:10.1246/bcsj.64.196
日期:1991.1
Fourteen metal halides (MXn) were each added to the solutions of aryliminodimagnesium (p-RC6H4N(MgBr)2, IDMg) in tetrahydrofuran, and the effect of MXn on relative yields of products was examined in the following three IDMg reactions: (A) oxidative coupling leading to symmetrical azobenzene, (B) condensation with nitrobenzene, and (C) condensation with o-hydroxy-substituted (o-HO) nitrobenzene. Reaction