Abstract
A comparative study of the thermal stability and combustion peculiarities of three dinitropyrazole isomers was carried out. It has been found that the rate-limiting stage of the decomposition of 1,3-dinitropyrazole (1,3-DNP) and 1,4-dinitropyrazole (1,4-DNP) both having the N-bounded nitro group, is the N → C migration of the nitro group rather than its elimination, followed by secondary decomposition reactions of non-aromatic 3H-pyrazole. In the case of 3,4-dinitropyrazole (3,4-DNP) the rate-limiting stage is assumed to be the nitro group elimination. All the studied pyrazole isomers revealed close burning rate vs. pressure dependences despite significant differences in the thermal stability and volatility.
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