In this review with broad coverage of recent literature references we present some general aspects of green
chemistry as well as a brief overview of transformations of 2H-pyran-2-ones and fused pyran-2-ones under green condition.
The emphasis is given on microwave-assisted transformations under various conditions, such as aqueous condition,
neat reactions, reactions in ionic liquids and, to provide a comparison, also the reactions under high pressure are presented.
Keywords: Aqueous conditions, high pressure chemistry, ionic liquids, microwave chemistry, neat reactions, 2H-Pyran-2-ones,
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