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Solvent-free and catalyst-free chemistry: A benign pathway to sustainability
Gawande, M., V. Bonifacio, R. Luque, P. Branco, AND R. Varma. Solvent-free and catalyst-free chemistry: A benign pathway to sustainability. ChemSusChem. Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, Germany, 7(1):24-44, (2014).
Submitted to the American Chemical Society (ACS) Journal, Chemical Reviews
In the past decade, alternative benign organic methodologies have become an imperative part of organic syntheses and novel chemical reactions. The various new and innovative sustainable organic reactions and methodologies using no solvents or catalysts and employing alternative energy inputs such as microwave (MW), sonication, conventional and room temperature heating conditions, mechanochemical mixing, and high speed ball milling are discussed here in detail. Environmentally benign and pharmaceutical important reactions such as multicomponent reactions, condensation reactions, Michael addition reactions, ring opening of epoxides, oxidation and other significant organic reactions are discussed. An overview of benign reactions via solvent-free and catalyst-free (SF-CF) chemistry and a critical perspective on emerging synergies between SF-CF organic reactions are discussed.