NaOH mediated reaction of nitrobenzenes in EtOH was performed at 80 C temperature affording azobenzenes in excellent yield. This methodology presents an easy synthesis of a wide variety of azo compounds from readily available nitrobenzene derivatives.a II-aniline, III-azoxybenzene, IV-azobenzene.

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An improved green route has been developed for the oxidation of sulfide compounds. Albendazole is converted to ricobendazole or albendazole sulfone using H 2 O 2 as an oxidant and H 2 O as the solvent. High yields of the corresponding products were obtained by carrying out the reaction at room temperature. This synthetic method is environmentally clean and safe, operationally simple for the oxidation of other benzimidazole anthelmintics and various sulfide compounds.

5Aryl sulfones have been first time synthesized by reaction of sodium p-toluenesulfinate and arenediazonium salts using CuI catalyzed homogeneous system. The developed protocol is simple and efficient new route for synthesis of diaryl sulfones with excellent product yield. The mild reaction conditions tolerate a range of functional groups. The best results were obtained with CuI, N,N'dimethylethylenediamine, TBAI and K 2 CO 3 in Dimethyl sulfoxide at 100 °C under inert atmosphere.