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208 ChemInform Abstract Benzonitrile (I) reacts with ammonium, alkyl-, dialkyl-, and trialkyl ammonium azides (II) to give 5-phenyltetrazole (III). Tetraalkylammonium azides do not react under these conditions. (IR-, NMR-data).

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204 ChemInform Abstract Methylation of the 2-methyltetrazoles (I) with excess dimethyl sulfat (II) gives the 1,3-dimethyltetrazolium salts (III). The analogous 1,4-dimethyltetrazolium salts (V), prepared from (IV), isomerize on heating to produce the more stable salts (III). (Yields only given for the conversion to the perchlorates).

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