Nanocrystalline magnesium oxide stabilized gold nanoparticles: an advanced nanotechnology based recyclable heterogeneous catalyst platform for the one-pot synthesis of propargylamines
Date
2011
Authors
Layek, K.
Chakravarti, R.
Kantam, M.L.
Maheswaran, H.
Vinu, A.
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Journal article
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Green Chemistry, 2011; 13(10):2878-2887
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Abstract
A simple and elegant synthesis of gold nanoparticles via counter ion stabilization of AuCl 4 - on nanocrystalline magnesium oxide support followed by sodium borohydride reduction is described here. A thorough characterization of the resulting heterogeneous material revealed the presence of uniformly distributed gold nanoparticles (10-12 nm) deposited on to (111) plane of quasi-crystalline icosahedral lattice of nanocrystalline magnesium oxide which exhibits excellent catalytic activity for the one pot synthesis of structurally divergent propargylamines via a three component coupling of an alkyne, an amine and an aldehyde without requiring any additives or inert atmosphere. The catalyst contains ultra low loading of gold (0.236 mol%), and turnover numbers as high as 400 are obtained. The catalyst can be isolated by simple centrifugation and reused for four cycles.
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Data source: Supporting information, http://www.rsc.org/suppdata/gc/c1/c1gc15518k/c1gc15518k.pdf
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Copyright 2011 The Royal Society of Chemistry