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Issue 4, 2014
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Efficient three-component coupling reactions catalyzed by Cu0-nanoparticles stabilized on modified montmorillonite

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Abstract

The in situ generation of Cu0-nanoparticles into the nanopores of modified montmorillonite and their catalytic performance in the three component (A3) coupling reactions of aldehyde, amine and alkyne to synthesize propargylamines have been described here. The modification of montmorillonite was carried out with HCl under controlled conditions for generating nanopores into the matrix and these pores act as a “host” for the in situ generation of Cu0-nanoparticles. The Cu0-nanoparticles were generated in the nanopores of the acid activated clay mineral matrix by the successful loading of a Cu(CH3COO)2 metal precursor using an incipient wetness impregnation technique followed by reduction with NaBH4. The TEM study reveals that Cu0-nanoparticles of below 10 nm in size are evenly distributed on the support. The synthesized Cu0-nanoparticles exhibit a face centered cubic (fcc) lattice. The Cu0-nanoparticles serve as an efficient green and heterogeneous catalyst for three-component coupling via C–H alkyne-activation to synthesize propargylamines with excellent yields (82–94%) and 100% selectivity under mild reaction conditions without requiring any additives or an inert atmosphere. The nanocatalysts can be recycled and reused several times without significant loss of their catalytic activity.

Graphical abstract: Efficient three-component coupling reactions catalyzed by Cu0-nanoparticles stabilized on modified montmorillonite

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Publication details

The article was received on 27 Aug 2013, accepted on 10 Dec 2013 and first published on 11 Dec 2013


Article type: Paper
DOI: 10.1039/C3CY00639E
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Citation: Catal. Sci. Technol., 2014,4, 1047-1054
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    Efficient three-component coupling reactions catalyzed by Cu0-nanoparticles stabilized on modified montmorillonite

    B. J. Borah, S. J. Borah, L. Saikia and D. K. Dutta, Catal. Sci. Technol., 2014, 4, 1047
    DOI: 10.1039/C3CY00639E

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