Synthesis, Acidity Constants and Tautomeric Structure of 7-Arylhydrazono[1,2,4]Triazolo[3,4-b][1,3,4]thiadiazines in Ground and Excited States
作者:Ahmad S. Shawali、Ibrahim F. Zeid、Mahmoud H. Abdelkader、Alsayed A. Elsherbini、Farag M. A. Altalbawy
DOI:10.1002/jccs.200100012
日期:2001.2
7-Arylhydrazono[1,2,4]triazolo[3,4-b][1,3,4]thiadiazines 4 were synthesized from the reactions of 4-amino-5-phenyl-4H-[1,2,4]triazole-3-thiol 2 and 2-(2-naphthyl)-2-oxoethanehydrazonoyl bromides 1 and their acid dissociation constants pK and pK*, in the ground and excited states, respectively, were determined. Both pK and pK* constants were correlated by Hammett equation. The pK and the spectral data
Screening of ligands for the Ullmann synthesis of electron-rich diaryl ethers
作者:Nicola Otto、Till Opatz
DOI:10.3762/bjoc.8.122
日期:——
In the search for new ligands for the Ullmanndiaryl ether synthesis, permitting the coupling of electron-rich aryl bromides at relatively low temperatures, 56 structurally diverse multidentate ligands were screened in a model system that uses copper iodide in acetonitrile with potassium phosphate as the base. The ligands differed largely in their performance, but no privileged structural class could
Deproto-metallation and computed CH acidity of 2-aryl-1,2,3-triazoles
作者:Floris Chevallier、Thomas Blin、Elisabeth Nagaradja、Frédéric Lassagne、Thierry Roisnel、Yury S. Halauko、Vadim E. Matulis、Oleg A. Ivashkevich、Florence Mongin
DOI:10.1039/c2ob25554e
日期:——
2-Aryl-1,2,3-triazoles were synthesized by cyclization of the corresponding glyoxal arylosazones, generated from commercial arylhydrazines. The deproto-metallation of 2-phenyl-1,2,3-triazole was attempted using different 2,2,6,6-tetramethylpiperidino-based mixed lithium–metal (Zn, Cd, Cu, Co, Fe) combinations, giving results in the case of Zn, Cd, and Cu. The lithium–zinc combination was next selected to apply the deprotonation–iodination sequence to all the 2-aryl-1,2,3-triazoles synthesized. The results were analyzed with the help of the CH acidities of the substrates, determined in THF solution using the DFT B3LYP method.
Sensitive Energetics from the
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‐Amination of 4‐Nitro‐1,2,3‐Triazole
作者:Dominique R. Wozniak、Benjamin Salfer、Matthias Zeller、Edward F. C. Byrd、Davin G. Piercey
DOI:10.1002/open.202000053
日期:2020.8
Energetic N‐amino‐C‐nitro compounds 1‐amino‐4‐nitro‐1,2,3‐triazole and 2‐amino‐4‐nitro‐1,2,3‐triazole are characterized for the first time as energeticmaterials. These compounds were characterized chemically by nuclear magnetic resonance (NMR), Infrared spectroscopy and X‐ray crystallography. Compounds were also characterized energetically by differential scanning calorimetry (DSC), impact, and friction
高能N-氨基-C-硝基化合物1-氨基-4-硝基-1,2,3-三唑和2-氨基-4-硝基-1,2,3-三唑首次被表征为含能材料。这些化合物通过核磁共振 (NMR)、红外光谱和 X 射线晶体学进行了化学表征。化合物还通过差示扫描量热法 (DSC)、冲击和摩擦进行了能量表征,并发现其具有敏感性和性能,将其归类为具有类似 PETN 性能的起爆药。
Thiol Oxidation by 1,2,3-Oxadiazolinium Ions, Presumed Carcinogens
作者:Richard N. Loeppky、Aloka Srinivasan
DOI:10.1021/tx00048a001
日期:1995.9
behavior of these compounds toward typical "cellular nucleophiles". Each of these substances oxidizes benzenethiol to diphenyldisulfide. The reaction in aqueous buffer at pH 7.4 is rapid. Reaction of 1b with benzenethiol gives, in addition to the disulfide, benzene, biphenyl, azobenzene, diphenylsulfide, aniline, and glycolaldehyde. Similar products are obtained from 3. Phenyldiazene is postulated as