The transformations of readily available 4-chloro-3,5-dinitropyrazole and its N-methylated derivative under the action of anionic S-/O-nucleophiles and neutral N-nucleophiles were studied. Independent of the substrate's charge (anionic, R = H, or neutral, R = Me), the nucleophilic substitution proceeds exclusively at position 4 replacing the chlorine nucleofuge. As a result of this study, the effective synthetic method for the preparation of 4-substituted 3,5-dinitropyrazoles via the nucleophilic substitution in 4-chloro3,5-dinitropyrazole was elaborated.
WO2023/72812
申请人:——
公开号:——
公开(公告)日:——
4-Chloro-3,5-dinitropyrazole: a precursor for promising insensitive energetic compounds
作者:Chunlin He、Jiaheng Zhang、Damon A. Parrish、Jean'ne M. Shreeve
DOI:10.1039/c2ta01359b
日期:——
A series of 3,5-dinitropyrazole derivatives was prepared from 4-chloro-3,5-dinitropyrazole in good yields and characterized by IR, 1H, and 13C NMR (some cases 15N NMR) spectroscopy, elemental analysis, and DSC. The structures of 7 and 13 were confirmed by single crystal X-ray diffraction. The impact sensitivity was determined using a standard BAM method, and detonation properties were obtained using experimental densities and calculated heats of formation.
<i>N</i>-Diazo-Bridged Nitroazoles: Catenated Nitrogen-Atom Chains Compatible with Nitro Functionalities
作者:Ping Yin、Damon A. Parrish、Jean'ne M. Shreeve
DOI:10.1002/chem.201402762
日期:2014.5.26
N‐diazo‐bridged azoles were synthesized based on oxidative coupling of N‐aminoazoles. Incorporation of extended catenated nitrogen‐atom chains with nitro groups led to compounds with favorable functional compatibilities. This combination gives rise to a series of high‐density energetic materials (HEDMs) with high heats of formation, enhanced densities, positive oxygen balances, and good detonation