Nanoparticle-Catalysed 1,3-Dipolar Cycloadditions

The 1,3-dipolar cycloadditions of azomethine-ylides and -imines, nitrones, nitrilimines, and azides catalysed by inorganic nanoparticles are described. Emphasis is given to the nanometric catalysts involved, their structure, characterisation, and recyclability and, when remarkable, their preparation. Whenever possible, the improvements with respect to cycloadditions performed with the usual (non-nano) catalysts are discussed.