14531-55-6Relevant articles and documents
Silica-sulfuric acid catalyzed nitrodeiodination of iodopyrazoles
Ravi,Gore, Girish M.,Sikder, Arun K.,Tewari, Surya P.
, p. 3463 - 3471 (2012)
We report here the synthesis of nitropyrazoles in good to excellent yields from iodopyrazoles over silica-sulfuric acid catalyst for the first time. The present procedure require less acid, offers a simplified workup procedure, and may be applied for the
A simple and environmentally benign nitration of pyrazoles by impregnated bismuth nitrate
Ravi,Gore, Girish M.,Tewari, Surya P.,Sikder, Arun K.
, p. 1322 - 1327 (2013)
We report herein a facile, rapid, and environmentally friendly synthesis of nitropyrazoles in good yields using silica-bismuth nitrate and silica-sulfuric acid-bismuth nitrate at room temperature for the first time. The relatively non-toxic nature, ease o
An antiferromagnetic metalloring pyrazolate (Pz) framework with [Cu12(μ2-OH)12(Pz)12] nodes for separation of C2H2/CH4 mixture
Li, Ziyin,Ye, Yingxiang,Yao, Zizhu,Guo, Junzhi,Lin, Quanjie,Zhang, Jindan,Zhang, Zhangjing,Wei, Fangfang,Xiang, Shengchang
, p. 19681 - 19688 (2018)
The search for functional metalloring organic frameworks (MROFs) has been of continuous interest in the fields of both molecular rings and metal-organic frameworks (MOFs) due to their importance in many multifunctional applications. Herein, a hierarchical pyrazolate framework MROF-12 with the topology of the Schl?fli symbol {460.66} is reported, which is constructed by an elongated rigid ligand and attractive metalloring cluster nodes [Cu12(μ2-OH)12(Pz)12]. MROF-12 not only adopts the unique functionalities of the metalloring clusters but also inherits the porous properties of MOFs. The large [Cu12(μ2-OH)12(Pz)12] metalloring nodes with the diameter of 12.202 ? endow MROF-12 with excellent stability and antiferromagnetism, and they are bridged by linear pyrazolate ligands (H2NDI) to form micro-mesoporous MROF with permanent porosity. The activated sample MROF-12a can exhibit a relatively high Brunauer-Emmett-Teller/Langmuir surface area (460.7/571.9 m2 g-1) as well as pore volume of 0.240 cm3 g-1. Dynamic fixed bed breakthrough experiments indicate that the separation of C2H2/CH4 or CO2/CH4 mixtures can be efficiently achieved through a column packed with MROF-12a solid.
Synthesis and Structural Characterisation of Lithium, Zinc, and Aluminium Pyrazolate Complexes
Rad, Nazli E.,Junk, Peter C.,Deacon, Glen B.,Taidakov, Ilya V.,Wang, Jun
, p. 520 - 528 (2020)
The reaction of nBuLi with 3,5-dimethylpyrazole (MepzH) in EtO or tmeda/hexane (tmeda = N,N,N,N-tetramethylethane-1,2-diamine) and with 3,5-dimethyl-4-nitropyrazolate (MepzHNO) in THF results in the formation of three structurally diverse lithium pyrazola
Synthesis of high-performance insensitive energetic materials based on nitropyrazole and 1,2,4-Triazole
Xu, Minxian,Cheng, Guangbin,Xiong, Hualin,Wang, Bohan,Ju, Xuehai,Yang, Hongwei
, p. 11157 - 11163 (2019)
A new family of symmetric (4-nitro-1H-pyrazole-3,5-diyl)bis(1H-1,2,4-Triazole)-based derivatives were obtained. All these new compounds were characterized by (1H, 13C)NMR spectroscopy, infrared spectroscopy, elemental analysis and differential scanning calorimetry (DSC). The structures of 5,5′-(4-nitro-1H-pyrazole-3,5-diyl)bis(3-nitro-1H-1,2,4-Triazole) (6) and N,N′-((4-nitro-1H-pyrazole-3,5-diyl)bis(1H-1,2,4-Triazole-5,3-diyl))dinitramide (7) were further confirmed by single crystal X-ray diffraction. In addition, the theoretical calculations by using the Gaussian 09 package show that target compounds have high heats of formation ranging from 1.40 to 2.84 kJ g-1. Among them, the safety and detonation performances of 6 (D: 8747 m s-1, P: 33.0 GPa, Td: 238.2 °C, IS: 30 J) and energetic salts dihydroxylammonium((4-nitro-1H-pyrazole-3,5-diyl)bis(1H-1,2,4-Triazole-5,3-diyl))bis(nitroamide) (9) (D: 9077 m s-1, P: 33.6 GPa, IS: >40 J) and dihydrazinium((4-nitro-1H-pyrazole-3,5-diyl)bis(1H-1,2,4-Triazole-5,3-diyl))bis(nitroamide) (10) (D: 8759 m s-1, P: 30.2 GPa, IS: >40 J) are comparable to those of 1,3,5-Trinitroperhydro-1,3,5-Triazine (RDX: D = 8795 m s-1, P = 34.9 GPa, Td = 210 °C, IS: 7.4 J) due to the positive effect of ternary hydrogen bonds.
gem-DINITRO COMPOUNDS IN ORGANIC SYNTHESIS. 2. SYNTHESIS OF 4-NITROPYRAZOLES FROM DINITROMETHANE AND ITS DERIVATIVES
Laikhter, A. L.,Cherkasova, T. I.,Semenov, V. V.
, p. 2463 - 2466 (1991)
A series of 4-nitropyrazoles was synthesized from dinitromethane and other gem-dinitro derivatives.New cyclization reactions of aliphatic azines with dinitromethane and an intramolecular cyclization of dinitroacetazines have been discovered, with which 4-nitropyrazoles substituted at the 3- and 5-positions of the pyrazole ring can be obtained in one stage.
Energetic Tricyclic Polynitropyrazole and Its Salts: Proton-Locking Effect of Guanidium Cations
Tang, Yongxing,Huang, Wei,Chinnam, Ajay Kumar,Singh, Jatinder,Staples, Richard J.,Shreeve, Jean'Ne M.
, p. 8339 - 8345 (2021)
An axisymmetric polynitro-pyrazole molecule, 3,5-di(3,5-dinitropyrazol-4-yl)]-4-nitro-1H-pyrazole (5), and its salts (6-12) were prepared and fully characterized. These compounds not only show promising energetic properties but also show a unique tautomeric switch via combining different cations with the axisymmetric compound (5). Its salts (6-9) remain axisymmetric when the cations are potassium, ammonium, or amino-1,2,4-triazolium. However, when the cations are guanidiums, the salts (10-12) dramatically become asymmetric owing to the fixed proton. The introduction of guanidium cations breaks the tautomeric equilibrium by blocking the prototropic transformations and results in the switch-off effect to tautomerism. The structural constraints of 1H NMR and 13C NMR spectra provide strong evidence for the unusual structural constraint phenomenon. These stabilized asymmetric tautomers are very important from the point of molecular recognition, and this research may promote further developments in synthetic and isolation methodologies for novel bioactive pyrazole-based compounds.
Chemical properties of derivatives of N-difluoromethyl-and N-2-H-tetrafluoroethylpyrazoles
Petko,Sokolenko,Yagupolskii
, p. 1177 - 1184 (2006)
Nitration, chlorination, bromination, and iodination reactions have been investigated for pyrazole derivatives containing a difluoromethylene fragment directly on a nitrogen atom. Conditions have been found for introducing a cyano group into the nucleus of N-2-H-tetrafluoroethylpyrazole and converting it into carboxyl or tetrazole functions. Springer Science+Business Media, Inc. 2006.
Faujasite catalyzed nitrodeiodination of iodopyrazoles
Ravi,Tewari, Surya P.
, p. 35 - 39 (2013)
Nitrodeiodination of iodopyrazoles using nitric acid/Faujasite has been investigated. The present procedure is simple, rapid and convenient and requires no sulfuric acid or oleum and may be applied for the synthesis of several nitropyrazoles in good yield
Rationally tuning host-guest interactions to free hydroxide ions within intertrimerically cuprophilic metal-organic frameworks for high OH- conductivity
Li, Ziyin,Zhang, Zhangjing,Ye, Yingxiang,Cai, Kaicong,Du, Fenfen,Zeng, Heng,Tao, Jin,Lin, Quanjie,Zheng, Ying,Xiang, Shengchang
, p. 7816 - 7824 (2017)
Hydroxide-anion-exchange membrane fuel cells (HEMFCs) are now considered as one of the most promising green energy-conversion technologies for stationary and mobile applications, showing high fuel conversion efficiency at high pH and low cost due to their ability to operate under basic conditions using non-precious metal catalysts. But one key impediment to commercialization is insufficient hydroxide ion (OH-) conductivity of the central HEM component. Here, we report the development of free OH- anion-containing metal-organic frameworks (FOMOFs) with rationally tunable host-guest interactions for HEMs with high OH- conductivity. Among three solids obtained by post-synthesis treatment of ultrastable MOF FJU-66 with various bases, free OH- anions are observed in FJU-66·[EVIm]OH with strong host-guest interactions between the MOF backbone and guest cations. Despite the lowest OH- concentration, FJU-66·[EVIm]OH exhibits the highest OH- conductivity close to 0.1 S cm-1. The high OH- conductivity achieved suggests the potential application of the FOMOFs for practical HEMs of fuel cells.