Abstract
Among a plethora of known and established oxidant in organic chemistry, hydrogen peroxide stands in a special position. It is commercially and inexpensively available, highly effective, selective, and more importantly it is compatible with current environmental concerns, dictated by principles of green chemistry. Several chemicals or their intermediates that are important in our daily life such as pharmaceuticals, flavors, fragrances, etc. are products of oxidation of alcohols. In this review, we introduce hydrogen peroxide as an effective, selective, green and privileged oxidant for the catalyzed oxidation of primary and secondary benzylic and heterocyclic alcohols to corresponding carbonyl compounds in different media such as aqueous media, under solvent-free conditions, various organic solvent, and dual-phase system.
Highlights
Nowadays, energy and environmental crises have resulted in the discovery of green technologies for progressive use in the chemical industry
Due to an urgent and important demand for greener approaches, the use of toxic solvents and reagents such as organic peroxides must be avoided. Green solvents such as water or solvent-free systems, clean oxidants such as O2 or H2O2, and recyclable catalysts should be considered in order to comply with the principles of green chemistry proposed by Anastas and Warner [2]
We recently reviewed the applications of pyridinium chlorochromate (PCC) as an important selective oxidant for oxidation of primarily and secondary alcohols to their corresponding carbonyl compounds [28]
Summary
Energy and environmental crises have resulted in the discovery of green technologies for progressive use in the chemical industry. Due to an urgent and important demand for greener approaches, the use of toxic solvents and reagents such as organic peroxides must be avoided Green solvents such as water or solvent-free systems, clean oxidants such as O2 or H2O2, and recyclable catalysts should be considered in order to comply with the principles of green chemistry proposed by Anastas and Warner [2]. As a continuation of these interests, we try to highlight the importance and efficacy of hydrogen peroxide as an effective and green oxidant in the catalyzed selective oxidation of primary and secondary benzylic alcohols and primary heterocyclic alcohols to their corresponding carbonyl compounds. We present an overview on the reasonable reaction mechanism and promising catalytic effects of the selective oxidation of alcohols which can be considered as dehydrogenation of alcohols
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