E-J Chem.,8(2), pp 491- 494

The powerful common oxidants are mostly derived from metals located around the middle of the first transition series. In contrast, the metals at the end of the first transition series are not capable of forming high-valent oxides and thus remain less studied. However, among these metals, nickel can readily form peroxide (NiO2) which was used for oxidation of several substrates.It was proved that a variety of alcohols could be converted to the corresponding .carbonyl compound by treatment with nickel peroxide in organic solvents.In 1974, George .and Balachandran published an excellent review covering most of the research which was carried out using nickel peroxide as oxidant.Since then, only sporadic reports have appeared.in the literature dealing with oxidation of various organic substrates by nickel peroxide. Solvent free reactions have become important due to increasing demand for clean and
efficient protocols.The elimination of volatile organic solvents in organic syntheses is a most important goal in �green� chemistry. Solvent-free organic reactions make syntheses simpler, save energy and prevent solvent wastes, hazards and toxicity .The oxidation of alcohol to carbonyl compounds is an important transformation in organic synthesis and because of its significant role, the development of newer oxidative protocols continues to receive attention in spite of the availability of several methods to accomplish this objective. The use of supported reagent has gained popularity because of the improved selectivity, reactivity and associated ease of manipulation.