26621-44-3Relevant articles and documents
3,4,5-Trinitropyrazole-based energetic salts
Zhang, Yanqiang,Guo, Yong,Joo, Young-Hyuk,Parrish, Damon A.,Shreeve, Jean'ne M.
, p. 10778 - 10784 (2010)
High-density energetic salts that are comprised of nitrogen-rich cations and the 3,4,5-trinitropyrazolate anion were synthesized in high yield by neutralization or metathesis reactions. The resulting salts were fully characterized by 1H, 13C NMR, and IR spectroscopy; differential scanning calorimetry; and elemental analysis. Additionally, the structures of the 3,5-diaminotriazolium and triaminoguanidinium 3,4,5-trinitropyrazolates were confirmed by single-crystal X-ray diffraction. Based on the measured densities and calculated heats of formation, the detonation performances (pressure: 23.74-31.89 GPa; velocity: 7586-8543 ms -1; Cheetah 5.0) of the 3,4,5-trinitropyrazolate salts are comparable with 1,3,5triamino-2,4,6-trinitrobenzene (TATB; 31.15GPa and 8114 ms -1). Impact sensitivities were determined to be no less than 35 J by hammer tests, which places these salts in the insensitive class.
Solubility, thermodynamic modeling and Hansen solubility parameter of a new type of explosive in four binary solvents (benzene + ethanol, n-propanol, n-butanol and isoamyl alcohol) from 283.15 K to 323.15 K
Guo, Hao-qi,Li, Yong-xiang,Yang, Yu-lin,Li, Zi-yang
, (2021)
The solubility of 3,4-dinitropyrazole (DNP) in four binary solvents (benzene + ethanol, n-propanol, n-butanol and isoamyl alcohol) was measured by a dynamic laser monitoring at the temperature from 283.15 K to 323.15 K at pressure of 0.1 MPa. The solubility of DNP increased positively with increasing temperature, while increased with decreasing molar fraction of benzene in each binary system. Moreover, the experimental solubility values of DNP in this work were correlated well with four thermodynamic models namely “the modified Apelblat equation, Jouyban-Acree model, NRTL model and Wilson model” obtaining average root-mean-square deviation (104RMSD) lower than 98.93 for correlative studies. In addition, Hansen solubility parameters were used to explain and predict the solubility behavior. Finally, mixing thermodynamic properties were estimated and analyzed based on solubility data and the Wilson model, and it's easy to understand that the dissolution was a spontaneous process from the results.
Crystal structure of 3,4-dinitropyrazole in water
Guo, Haoqi,Yu, Siyuan,Li, Yongxiang,Wang, Jianlong,Cao, Duanlin,Qin, Zexin
, p. 43 - 49 (2019)
3,4-dinitropyrazole (DNP) was synthesized by N-nitration, thermal rearrangement and C-nitration with pyrazole as the raw material. A pure DNP single crystal was obtained by solvent evaporation using water as a solvent, and its structure was characterized by X-ray single crystal diffraction. The results showed that the single crystal structure of DNP contained water, and the molar ratio of DNP/water was 4:1. The DNP molecules existed stably due to the presence of intermolecular and intramolecular hydrogen bonding, as well as π-π stacking between DNP molecules. This study was valuable to the production and application of DNP.
Comparison of Functionalized Lithium Dihydrobis(azolyl)borates with Their Corresponding Azolates as Environmentally Friendly Red Pyrotechnic Coloring Agents
Dufter, Alicia M. W.,Klap?tke, Thomas M.,Rusan, Magdalena,Schweiger, Alexander,Stierstorfer, J?rg
, p. 2044 - 2050 (2020)
The recent awareness of the impact of strontium on health has stimulated research efforts on lithium-based red pyrotechnic colorants. We have previously shown lithium dihydrobis(azolyl)borates to be promising candidates due to their favorable adjustment to a reductive and low-temperature flame atmosphere. These compounds are assumed to be sufficiently stable only if the pKa values of the heterocycles are between 5 and 20. Apart from their acidities, functionalization of 1H-tetrazole and 1H-pyrazole with nitro or amino groups, respectively, tailors the oxygen balances of the resulting Lewis acid base adducts to enhance the fuel-rich flame environment or to make them oxidizing agents. This work determines whether the lithium salts of dihydrobis(3-nitropyrazol-1-yl)borate and dihydrobis(5-aminotetrazol-1-yl)borate are suitable replacements for strontium-containing color imparters. Furthermore, the influence of potentially green-light-producing boron is evaluated by comparing the emissions of the lithium borates and the corresponding lithium azolates.
Lithium Nitropyrazolates as Potential Red Pyrotechnic Colorants
Dufter-Münster, Alicia M. W.,Harter, Alexander G.,Klap?tke, Thomas M.,Reinhardt, Elena,R?mer, Julia,Stierstorfer, J?rg
, (2022/02/09)
Strontium-based red pyrotechnic colorants have fallen into disrepute due to the harmful influence of this alkaline earth metal on adolescents. In this context, the energetic character, safety, and combustion to benign nitrogen gas of nitropyrazoles are used for the design of the corresponding lithiated materials, which are investigated as potential replacements in the current work. For this purpose, the lithium salts of 3,4-dinitro-1H-pyrazole, 3,5-dinitro-1H-pyrazole, 4-amino-3,5-dinitro-1H-pyrazole, 3,4,5-trinitro-1H-pyrazole, and 4-hydroxy-3,5-dinitro-1H-pyrazole were extensively characterized by standard analytical methods, low-temperature single-crystal X-ray diffraction, studies of the thermo-chemical behavior, and sensitivity assessments. Our assumption that the high nitrogen contents and the low oxygen balances of these compounds would adjust a cool, reductive flame atmosphere essential for red emissions by lithium was put to the test.
PYRROLO(PYRAZOLO)PYRIMIDINE DERIVATIVE AS LRRK2 INHIBITOR
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Paragraph 0088, (2020/11/23)
The present invention relates to a pyrrolo(pyrazolo)pyrimidine derivative having efficacy as an LRRK2 inhibitor, a preparation method therefor, and a pharmaceutical composition for preventing or treating degenerative brain diseases, containing the same.
