Efficient three-component coupling reactions catalyzed by Cu super(0)-nanoparticles stabilized on modified montmorillonite

The in situgeneration of Cu super(0)-nanoparticles into the nanopores of modified montmorillonite and their catalytic performance in the three component (A super(3)) coupling reactions of aldehyde, amine and alkyne to synthesize propargylamines have been described here. The modification of montmoril...

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Bibliographic Details
Published in:Catalysis science & technology 2014-03, Vol.4 (4), p.1047-1054
Main Authors: Borah, Bibek Jyoti, Borah, Subrat Jyoti, Saikia, Lakshi, Dutta, Dipak Kumar
Format: Article
Language:English
Subjects:
Aldehydes
Alkynes
Catalysis
CATALYSTS
JOINING
MICROSTRUCTURES
Montmorillonite
Nanostructure
PARTICLES
Porosity
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Summary:The in situgeneration of Cu super(0)-nanoparticles into the nanopores of modified montmorillonite and their catalytic performance in the three component (A super(3)) 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 situgeneration of Cu super(0)-nanoparticles. The Cu super(0)-nanoparticles were generated in the nanopores of the acid activated clay mineral matrix by the successful loading of a Cu(CH sub(3)COO) sub(2) metal precursor using an incipient wetness impregnation technique followed by reduction with NaBH sub(4). The TEM study reveals that Cu super(0)-nanoparticles of below 10 nm in size are evenly distributed on the support. The synthesized Cu super(0)-nanoparticles exhibit a face centered cubic (fcc) lattice. The Cu super(0)-nanoparticles serve as an efficient green and heterogeneous catalyst for three-component coupling viaC-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.
ISSN:2044-4753
2044-4761
DOI:10.1039/c3cy00639e