Habib-ur-Rehman Shah, Khalil Ahmad, Hafiza Ammara Naseem
Jul 26, 2021
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Influential Citations
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Journal
Journal of Molecular Structure
Abstract
Abstract Azo compounds are important class of compounds because of their broad range of applications. So it is necessary to have versatile methods of synthesis to get new and effective azo derivatives. This review covers the synthetic methodology with emphasis on the classical and versatile ones. The overall feasible methods for azo compounds synthesis mentioned in this review include, diazotization/azo coupling, solvent free-silica supported boron trifluoride, methyl nitrite-active iron based-Japp-Kalingemann, Novartis/Ciba-Geigy-Cupric chloride catalyzed-Mild one-pot two step-nitroamatics and anilines-deoxygenation of nitrobenzene-decomposition of N,N, Ortho para benzoquinonediimines dioxide dehydrogenation, arylhydrazines dimerization reaction of diazonium salts-metal catalyzed coupling, Opening of benzotriazoles-Oxidation of anilines-arylcalcium and nitrous oxide-quinone acetals and arylhydrazines-quinones, reduction of azoxybenzenes and azo-MOFs, etc, which yield azo compounds in good to moderate yields and not commonly used now a day. The most widely used methods to synthesize azo compounds are by Mills reaction and azo coupling which are important in industrial point of view. Though there are various reported methods to get azo compounds but they have limitations as well. So above mentioned methods are reliable and yield azo compounds in good to moderate yield but there is still a need to have latest and efficient methods keeping in view the advantages and disadvantages of above mentioned compounds. Therefore, it is compulsory to have innovative and more efficient method for synthesis of azo compounds.