Using N-Bromosuccinimide and Pyridine as the Oxidation System to Prepare Carbonyl and Aryl Azo Compounds

Using N-bromosuccinimide and pyridine as the oxidation system to dehydrogenate aryl substituted semicarbazide or carbazide to form azo compounds in one phase is described first time in this paper. Nineteen azo compounds have been prepared in excellent yield under mild condition. This method only needs simple instrument and short reaction time.