Nucleophilic addition of azoles to triphenyl-(phenylethynyl)phosphonium bromide and base hydrolysis of the addition products

Reactions of pyrazole, 3,5-dimethylpyrazole, imidazole, and 1,2,4-triazole with triphenyl(phenylethynyl)phosphonium bromide gave the corresponding 2-azolyl-2-phenylethenyl(triphenyl)phosphonium salts. Base hydrolysis of the addition products led to the formation of 2-azolyl-1,2-diphenylethyl(diphenyl)phosphine oxides.