Synthesis Of Insensitive Explosive About Pyridine Derivatives

Most of Nitro- Pyridine compounds are attributed to high-nitrogen energetic materials, which possess the character of high-nitrogen content and high formation enthalpy, which are the solid compounds of better safety and invariability, therefore, they are of vital significance in the explosive domain. The people have been always exploring the high-energy, high-density, good-thermostability materials which contain carbon ,oxygen, hydrogen, nitrogen in the industry, military affairs spatial application,etc. These compounds should possess high explosive effect and insensitivity to heat. friction, scintilla, hit and so on. Recently the multi-nitryl pyridine compounds have been paid more attention to seek for a new, high-energy, low-insensitivity explosive of whose energy is sorption to TATB.In this paper, the feasibity of high-energy, low-sensitivity nitro-pyridine compounds which are synthesized from3,5-dichloropyridine by oxynitration couse and nonxynitration course is investigated.(1) oxynitration course: the compounds are synthesized from 3,5-dichloropyridine by oxidation, nitration, amenation. The results showed that the yield of nitration is low and the nitric atom only could replace the position 4 of 3,5-dichloropyridine it was substituded for 3,5-dichloro-4-aminopyridine.When the amino reaction happened, this course is not feasible.(2)nonoxynitration course: the nitropuridine compounds are synthesized from 3,5-dichloropyridine by methoxylation, nitration, amenation. The important intermediate 3-methoxy-5-chloro-2,6-diritropyridine was synthesized, its crystal structure and reaction activity are analysed.And5-methoxy-6-nitro-7-azobenzofuroxan is synthesized.All the compounds are characterized by IR,1HNMR,MS and element analysis, and their structures are assured.The electrophilic reaction mechanism and nucleophilic reaction mechanism of pyridine and its derivatives are discussed, the electronegativity of nitrogen atom is bigger than carbon atom on the pyridine circle, so it can accommodate bigger negative charge. The nitrogen atom can cause the electron cloud on the pyridine circle to redistribute, and determine the electrophilic reaction characties and the nucleophilic reaction characties.