N3‐Acylamidrazone ylides 3 were synthesized by the reaction of 2‐(iminophenylmethyl)‐1,1,1‐trimethylhydrazinium hydroxide, inner salt (2a) or 2‐(1‐iminoethyl)‐1,1,1‐trimethylhydrazinium hydroxide, inner salt (2b) with acyl chlorides or acetic anhydride. Thermolysis of 3 gave 3,5‐disubstituted oxadiazoles 4 and trimethylamine.
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Smith et al. (1983) studied this question.
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