“…As energetic nitrogen heterocyclic groups, furazan and furoxan feature high heats of formation, good thermal stabilities, great densities, and a high amount of active oxygen, which makes them highly efficient structural units in the development of high-energy-density materials (HEDMs) [1][2][3][4][5][6][7][8]. Moreover, substituting a furazan ring or an furoxan ring for a nitro group, the density and detonating velocity can increase about 0.06-0.08 g cm À3 and 300 m s À1 [9][10][11], which leads to the synthesis of multi-furazan ring compounds and multi-furazan ring oxides, such as difurazans, chained furazans, macrocyclic furanzans, ring-fused furazans, and other furazan or furoxan derivatives [8][9][10][11][12][13][14][15][16]. Many derivatives have shown good physicochemical properties and applied prospect.…”