Click chemistry from organic halides, diazonium salts and anilines in water catalysed by copper nanoparticles on activated carbon

An easy-to-prepare, reusable and versatile catalyst consisting of oxidised copper nanoparticles on activated carbon has been fully characterised and found to effectively promote the multicomponent synthesis of 1,2,3-triazoles from organic halides, diazonium salts, and aromatic amines in water at a low copper loading.Spanish Ministerio de Ciencia e Innovación (MICINN; CTQ2007-65218 and Consolider Ingenio 2010-CSD2007-00006), and the Generalitat Valenciana (GV; PROMETEO/2009/039)