Articles written in Journal of Chemical Sciences

    • Multicomponent click reactions catalysed by copper(I) oxide nanoparticles (Cu2ONPs) derived using Oryza sativa


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      A procedure for the expedient synthesis of well-characterized Cu(I) oxide nanoparticles (Cu2-ONPs) from Cu(II) salts by employing Rice (Oryza sativa) as a cheap and ready source of reducing as well as stabilizing agent has been demonstrated. The judicious choice of rice as a catalyst has helped in the symbiotic combination of two events: viz., acidic hydrolysis of starch to form glucose and the subsequent formal reduction of Cu2+ by the in-situ generated monosaccharide reducing sugar (glucose) under the alkaline condition to produce Cu2O. Further, rice was also found to be effectively stabilizing the nanoparticles from agglomeration. Optical and microscopic techniques were suitably employed for the characterization of the nanoparticles of approximately 10 nm size. Furthermore, the specifically generated nanoparticles were foundto be active catalysts in an aqueous medium for Azide-alkyne Huisgen cycloaddition (Click reaction) under base free condition via one-pot multi-component addition for the synthesis of mono-, bis- and tris-1,2,3-triazoles in good to excellent yields.

    • Copper nanoparticles (CuNPs) catalyzed chemoselective reduction of nitroarenes in aqueous medium


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      A procedure for practical synthesis of CuNPs from CuSO4.5H2O is established, under appropriatereaction conditions, using rice (Oryza sativa) as an economic source of reducing as well as a stabilizing agent.Optical and microscopic techniques are employed for the characterization of the synthesized CuNPs and thesizes of the particles were found to be in the range of 8 ± 2 nm. The nanoparticles are used as a catalyst forchemoselective reduction of aromatic nitro compounds to corresponding amines under ambient conditionsand water as a reaction medium.

      CuNPs are synthesized using hydrolysed rice and used as catalyst for chemoselective reduction of nitroarenes to their corresponding amines in water.

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