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Microwave-Assisted Eco-Friendly Synthesis of Organics and Nanomaterials
Citation:
VARMA, R. S. Microwave-Assisted Eco-Friendly Synthesis of Organics and Nanomaterials. Presented at Zing Conference on Microwave and Flow Chemistry Conference 2009, Bolans Village, Antigua, Bolans Village, ANTIGUA, January 28 - 31, 2009.
Impact/Purpose:
To inform the public.
Description:
This presentation summarizes our recent activity in MW-assisted synthesis, which involves benign alternatives, such as the use of supported reagents, and greener reaction medium in aqueous or solvent-free conditions.1 The greener synthesis of heterocyclic compounds, coupling reactions, and a variety of name reactions2 are the primary beneficiaries as exemplified by the synthesis of N-aryl azacycloalkanes, isoindoles, and dihydropyrazoles, 1,3,4-oxadiazoles, 1,3,4-thiadiazoles, 1,3-dioxanes, pyrazoles, hydrazones and 3,4-dihydropyrimidin-2(1H)-ones, catalyzed by basic water or polystyrene sulfonic acid (PSSA) in aqueous media or solid supported Nafion®NR50 under solvent-free conditions.2 Shape-controlled aqueous synthesis of noble nanostructures via MW-assisted spontaneous reduction of noble metal salts using a-D-glucose, sucrose, and maltose will be presented.3a A general MW method has been developed that accomplishes the cross-linking reaction of poly (vinyl alcohol) (PVA) with metallic systems such as Pt, Cu, and In; bimetallic systems, namely Pt-In, Ag-Pt, Pt-Fe, Cu-Pd, Pt-Pd and Pd-Fe;3b and SWNT, MWNT, and C-60.3c The strategy is extended to the formation of biodegradable carboxymethyl cellulose (CMC) composite films with noble nanometals;3d such metal decoration and alignment of carbon nanotubes in CMC is possible using MW approach3e which also enables the shape-controlled bulk synthesis of Ag and Fe nanorods in poly (ethylene glycol).3f MW hydrothermal process delivers magnetic nanoferrites4 and micro-pine structured catalysts are also obtainable in water from readily available metal salts.5 The eco-friendly generation of nanomaterials and nanocomposite with a variety of renewable polymers in benign matrices bodes well for the future sustainable endeavors.
URLs/Downloads:
MICROWAVE AND FLOW CHEMISTRY CONFERENCE 2009
FOR FURTHER INFORMATION_PRINCIPAL INVESTIGATOR.PDF (PDF, NA pp, 5 KB, about PDF)