Azide-tetrazole tautomerism of diazidodiazines and their benzo analogs

It has been discovered with the aid of IR and NMR spectroscopy that 5-azidotetrazolo 1,5-a]quinazoline exists in solutions in a tautomeric equilibrium with ditetrazolo 1,5-a:1,5-c]quinazoline, and the thermodynamic and kinetic characteristics of the equilibrium have been determined. Azide-tetrazole tautomerism is not observed under these conditions for ditetrazolo1,5-a:5,1-c]pyrazine, 6-azidotetrazolo 1,5-b]pyridazine, and their benzo analogs.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 2002–2007, September, 1989.