azo compoundsazo compounds (diazo compounds, triazenes etc.) (benzene compounds) Q 0160 -088Using N-Bromosuccinimide and Pyridine as the Oxidation System to Prepare Carbonyl and Aryl Azo Compounds.-A new and simple method for the dehydrogenation of aryl-substituted semicarbazides (I) and carbazides (III) to the corresponding azo-compounds using NBS and pyridine as oxidation system is described. A possible mechanism of the reaction is given. -(WANG, Y.-L.; WANG, X.-Y.; LI, J.-P.; MA, D. L.; WANG, H.; Synth.