Multi-walled carbon nanotubes loaded with Pd(0) clusters (average size distribution 9 nm) have been used under microwave irradiation as catalysts in hydrogenation and alkynylation reactions under “eco-friendly” conditions; reduced cinnamic esters and cross-coupled products were obtained in good yields; use of piperidine as the base provided, in a regiospecific process, novel doubly alkynylated compounds unambiguously characterized by NMR correlation experiments and X-ray diffraction.
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Olivier et al. (2008) studied this question.
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