Benzo-1,2,3,4-tetrazine 1,3-dioxides annulated with tetraazapentalene systems

Thermolysis of 7-azido-6-(2H-1,2,3-triazol-2-yl)-1,2,3,4-benzotetrazine 1,3-dioxide and 7-azido-6-(1H-1,2,3-triazol-1-yl)-1,2,3,4-benzotetrazine 1,3-dioxide gives rise to the new heterocyclic systems: 6,10-dehydro-6H,10H-1,2,3]triazolo1′,2′:2,3]1,2,3]triazolo4,5-g]-1,2,3,4]benzotetrazine 2,4-dioxide and 6,8-dehydro-6H,8H-1,2,3]triazolo1′,2′:1,2]1,2,3]-triazolo4,5-g]1,2,3,4]benzotetrazine 2,4-dioxide, respectively, their thermal stability and spectral properties have been studied.