Preparation of α,β-acetylenic ketones by catalytic heterogeneous oxidation of alkynesElectronic Supplementary information (ESI) available: details of the synthesis and characterisation of authentic ynones; kinetic curves of the oct-4-yne oxidation under air and under argon; mass spectra of oct-4-yn-3-one and 4-phenylbut-3-yn-2-one obtained in labelling studies; DR UV-vis spectra of catalyst 2 before and after 3 successive oxidations. See http://www.rsc.org/suppdata/cc/b2/b204122g/