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Alkylphenyl- and dialkylacetylenes are oxidized by the DMSO—PdCl2 or DMSO—Pd/C system to give the corresponding 1,2-diketones. Oxidation of these compounds, unlike that of diarylacetylenes, is less selective and is accompanied by the partial cleavage of triple bonds and formation of ketones, 1,3-diketones, and aromatic compounds as secondary condensation products.
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