A Simple and Efficient Method for the Oxidation of Aryl Substituted Semicarbazide with NaNO<sub>2</sub>/NaHSO<sub>4</sub>·H<sub>2</sub>O/SiO<sub>2</sub>under Mild Conditions
作者:Xiao-Chuan Li、Yu-Lu Wang、Jin-Ye Wang
DOI:10.1002/jccs.200200062
日期:2002.6
In this paper, eighteen aryl substituted semicarbazide underwent efficient oxidation to aryl azo compounds using NaNO 2 /NaHSO 4 .H 2 O/SiO 2 under mild conditions with excellent yields.
Phase Transfer Catalyzed Dehydrogenation Synthesis of Azo Ureas From Aryl Substituted Semicarbazide
作者:Y. L. Wang、J. Y. Wang、J. P. Li、D. L. Ma
DOI:10.1080/00397919608003768
日期:1996.10
possible mechanism is suggested by a “Galvinoxyl” radical act on arylsubstituted semicarbazide formed azo compounds. Synthesis of bis (Substituted phenyl) Carbodiazone Compounds (ArN = NCON = NAr') have been reported1, As another part of our studies, 1, 4-di-Substituted azo Compounds (ArNHCON=NAr') Were Synthesized by the reaction of Substituted Semicarbazide Compounds With a phase transfer Catalyst-“Galvinoxyl”
Abstract Using 4-hydroxy-2,2,6,6-tertramethyl-l-piperidinyloxyl as the phasestransfer dehydrogenation catalyst to prepare azo compounds is reported first time, ten N, 2-diaryl diazenecarboxamides were synthesized in high yield under mild condition. A possible mechanism was suggested by a nitroxide free radical which acted on substituted semicarbazides to form azo compounds.