268ChemInform Abstract The reactions between the ferrocenylcarbinols (I) and the 5-aryltetrazoles (II) in glacial AcOH proceed regiospecifically to yield the 2-ferrocenylalkyl derivatives (III) as the sole products. The structures of the ferrocenylcarbinols and the electronic nature of the aryl group of the tetrazoles (II) have no influence on the outcome of the reactions. The reactions are believed to occur between ferrocenylcarbonium cations formed under the acidic conditions and tetrazolate anions. This assumption is confirmed by further experiments. Inan analogous manner the bis-hydroxyalkylferrocenes (IV) yield the bis-2,2'-tetrazoloferrocenes (V) on reaction in glacial AcOH.

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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