Synthesis of 4-Amino-5-nitro-7H-pyrazolo3,4-d1,2,3triazine-2-oxide and Its Heat-Resistant Derivatives

4-Amino-5-nitro-7 H -pyrazolo3,4- d 1,2,3triazine-2-oxide ( PTO ) is synthesized via one step in this study. Subsequently, 4,7-diamino-5-nitro-pyrazolo3,4- d 1,2,3triazine-2-oxide ( APTO ), 4-oxo-5-nitro-7 H -pyrazolo3,4- d 1,2,3triazine-2-oxide ( OPTO ), and several heat-resistant salts are synthesized through local structural modifications on PTO . Comparison of thermal stability between PTO and APTO indicates that while the amino group has a negative impact on the thermal stability of APTO, it enhances the detonation performance of APTO and effectively reduces its mechanical sensitivity. Our findings provide a practical new approach for constructing energetic materials with excellent stability.