Layek, K.Chakravarti, R.Kantam, M.L.Maheswaran, H.Vinu, A.2025-12-172025-12-172011Green Chemistry, 2011; 13(10):2878-28871463-92621463-9270https://hdl.handle.net/11541.2/116485Data source: Supporting information, http://www.rsc.org/suppdata/gc/c1/c1gc15518k/c1gc15518k.pdfA 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.enCopyright 2011 The Royal Society of Chemistrymagnesium oxidepropargylaminesJournal article10.1039/c1gc15518k2-s2.0-80053551941