Anions Containing Tripoid Conjugated N 4 - System: Salts of 5-(Substituted Amino)-[1,2,3]triazolo[4,5- c ][1,2,5]oxadiazol-5-ium-4-ides, as well as Their Synthesis, Structure, and Thermal Stability.

A strategy for the synthesis of 5-((2-cyanoethyl)-X-amino)-[1,2,3]triazolo[4,5- c ][1,2,5]oxadiazol-5-ium-4-ides (X = H; CH 2 CH 2 CN; NO 2 ( 4a ); CN ( 4b ); CO 2 Et ( 4c )) starting from 3-amino-4-azido-1,2,5-oxadiazole was developed. The key step in this strategy is the intramolecular thermolytic cyclization of the azido group and the bis(2-cyanoethyl)triazene group. Removal of the 2-cyanoethyl protecting group from amides 4a - c gave potassium salt of the corresponding nitramide and sodium salts of cyano- and ethoxycarbonylamide. The structure and thermal stability of the synthesized compounds were studied experimentally using multinuclear NMR spectroscopy, X-ray crystallography, thermogravimetry, and differential scanning calorimetry.