Optimization on synthesis process and characterization of 1-methyl-3, 4-dinitropyrazoles

1-Methyl-3, 4-dinitropyrazole(MDNP) was synthesized using 3-nitropyrazole as starting material via nitration and methylation, and its structrue was characterized by infrared spectrum(IR), proton nuclear magnetic resonance (¹H NMR) and differential scanning calorimetry (DSC). The methylation reaction conditions were optimized. Results show that its thermal decomposition temperature is 298℃, and melting point is 20℃, having good thermal stability. The optimum conditions of methylation reaction is as follows: the reaction temperature 90℃, the reaction time 6.5 h, the molar ratio of 3, 4-dinitropyrazoles, DMC(dimethyl carbonate) to anhydrous potassium carbonate 1:10.5:1.5, and the yield of target product is 55.6%.