A Simple and Efficient Route for Preparing 4-Chloro-3,5-Dinitropyrazole

Abstract

4-Chloro-3,5-dinitropyrazole(ClDNP) as an insensitive energetic compound has been prepared with 4-Chloropyrazole(4-ClP)via nitrated by mixture of nitric acid and sulfuric acid. The reactionconditions were investigated, such as the molar ratio of 4-chloropyrazole and HNO3, reaction temperature, reaction time. Through the single factor experiment, the optimum reaction condition was determined that the molar ratio of 4-chloropyrazole and HNO3 was 1:4, the reaction time was 4h, the reaction temperature was 100-105°C. The yield of the ClDNP was up to 73.8% under the above conditions．The ClDNP was re-crystallization by methylbenzene.The target product was characterized by IR, 1H NMR, 13C NMR and Gauss Photography．