The tautomerism of 5-aminotetrazole

In the reaction of 5-amino-1-methyltetrazole and 5-amino-2-methyltetrazole with carboxylic acid anhydrides or chlorides, diacylamides are obtained in addition to monoacyl derivatives. The results of independent synthesis and a study of IR and PMR spectra have shown that in the diacylamides considered both acyl groups are attached to the same (the exocyclic) nitrogen atom.For part VI, see [1].