Studies on Organic Fluorine Compounds. XLII. Synthesis and Reactions of Phenyltrifluoromethylacetylenes

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Phenyltrifluoromethylacetylene (4a) was synthesized by the pyrolysis of triphenylphosphonium α-(trifluoroacetyl) benzylide (3a), which was easily derived from benzyl halide (1a). This method can be used for the synthesis of 4-substituted-phenyltrifluoromethylacetylenes (4). The 1, 3-dipolar reaction of 4 with diazomethane and phenyl azide proceeds readily to give trifluoromethylated pyrazoles and triazoles.