Showing papers on "Triazene published in 2020"
TL;DR: In this paper, a range of diazonium salts and their corresponding triazenes have been prepared to directly compare their relative thermal stabilities (via initial decomposition temperature) from differential scanning calorimetry (DSC) data.
30 citations
TL;DR: A directing-group-enabled Huisgen cycloaddition of azides and alkynes for the synthesis of functionalized triazoles in which the triazene group could act as a directing group to enable this regioselective [3 + 2] cycloadDition and further replacement by diverse groups, including amino, amide, halogen, and heterocycle substituents.
29 citations
TL;DR: The 4-fluoro substituted derivative might be considered as an interesting lead due to its effective inhibitory action against both hCA I and hCA II, a profile rarely seen among other sulphonamide CA inhibitors, making it of interest in systems where the activity of the two cytosolic isoforms is dysregulated.
Abstract: A series of compounds incorporating 3-(3-(2/3/4-substituted phenyl)triaz-1-en-1-yl) benzenesulfonamide moieties were synthesised and their chemical structure was confirmed by physico-chemic...
22 citations
TL;DR: Donor-acceptor cyclopropanes substituted with 3,3-dialkyltriazenyl groups are described herein, allowing for catalyst-free ring-opening reactions with methanol and tetracyanoethylene under mild conditions.
16 citations
TL;DR: In this article, a Lewis base catalyzed ring expansion of isatin with 2,2,2-trifluorodiazoethane (CF3CHN2) is developed.
11 citations
TL;DR: A triazene derivative and its transition metal complexes were prepared and characterized using molar conductance, magnetic susceptibility measurements, IR, UV-visible, NMR spectral studies wherever possible and applicable as mentioned in this paper.
Abstract: A triazene derivative and its transition metal complexes were prepared and characterized using molar conductance, magnetic susceptibility measurements, IR, UV–visible, NMR spectral studies wherever possible and applicable. The structure of the ligand and metal complexes was further confirmed using DFT calculations with the help of B97d method with 6-311++G(d,p) basis set. The antidiabetic and antioxidant activities of the ligand and the metal complexes were studied. The ligand showed potential biological activities which increased on chelation with metal ion. Apart from this, the molecular docking studies were carried out in order to understand the binding interaction of the ligand and its metal complexes with active sites of the target proteins.
10 citations
TL;DR: In this paper, the reaction of 2-bromoaniline with sodium nitrite affords a triazenido compound, 1,3-bis[(2bromo)benzene]triazene (HL).
Abstract: The reaction of 2-bromoaniline with sodium nitrite affords a triazenido compound, 1,3-bis[(2-bromo)benzene]triazene (HL). Spectroscopic investigations show that HL bears a high selectivity for silv...
8 citations
TL;DR: In all cases, coordination of the acid to the N1 atom of the triazene is observed, of relevance for acid-induced cleavage reactions, but also for metal-catalyzed reactions with triazenes, which are increasingly being used in synthetic organic chemistry.
Abstract: The synthetic utility of triazenes rests on the fact that the triazene function can be cleaved by Bronsted or Lewis acids, liberating diazonium compounds. However, the preferred coordination site of the acid is still a matter of debate. We have analyzed triflic acid, B(C6F5)3, and PdCl2 adducts of triazenes by NMR spectroscopy and single crystal X-ray crystallography. In all cases, we observe coordination of the acid to the N1 atom of the triazene. This finding is not only of relevance for acid-induced cleavage reactions, but also for metal-catalyzed reactions with triazenes, which are increasingly being used in synthetic organic chemistry.
8 citations
TL;DR: The sterically bulky non-symmetrical triazene, DmpN3(H)Dipp∗, was prepared by metalation of the parent triazenes as mentioned in this paper.
4 citations
TL;DR: In this paper, the development of novel multi-substituted aryl-phosphonate compounds offers promise as new building blocks for metal-organic frameworks (MOFs) materials with excellent properties in regards to por...
Abstract: The development of novel multi-substituted aryl-phosphonate compounds offers promise as new building blocks for metal-organic frameworks (MOFs) materials with excellent properties in regards to por...
2 citations
TL;DR: In this paper, the solid phase of isolated solvate [Cu(hfac)2L]·0.5MePh, where hfac is hexafluoroacetylacetonate, consists of polymer chains inside which Dipyridine (L) acts as a bridge, linking together Cu(hfa)2 moieties by N atoms of pyridine rings.
Abstract: 4,4′-(Triaz-1-ene-1,3-diyl)dipyridine (L) and the first transition metal complex with it are synthesized. It is found that the solid phase of isolated solvate [Cu(hfac)2L]·0.5MePh, where hfac is hexafluoroacetylacetonate, consists of polymer chains inside which L acts as a bridge, linking together Cu(hfac)2 moieties by N atoms of pyridine rings. The chains, in turn, are arranged into layers by H bonds. The result shows that L can be a bridging ligand in the synthesis of new coordination polymers.
TL;DR: In this paper, the first time the uranium determination in industrial effluents by differential pulse adsorptive stripping voltammetry using triazene compound as a binder was reported.
Abstract: This study reports for the first time the uranium (U) determination in industrial effluents by differential pulse adsorptive stripping voltammetry using triazene compound as a binder. Analyses were performed in 0.01 mol L−1 acetate buffer (pH 4.4), and the binder used was 1-methyl-3-(p-carboxyphenyl)triazene 1-oxide with the complex reduction peak at − 0.38 V. A detection limit of 0.06 and a quantification limit of 0.20 µg L−1 were achieved. The recovery values of spiked samples were between 80 and 100% (RSD less than 10.4%), and the concentration range from 0.35 to 7 μg L−1 was linear (r2 = 0.99). The values of U quantified in the samples INB-01, INB-02, INB-03 and INB-04 were 10.74, 30.58, 58.21 and 956.56 μg L−1, respectively. The complex formed is irreversibly reduced on the electrode surface, with the transfer of two electrons, and the process is controlled by diffusion. Additionally, it is suggested that the U(VI) center coordinates itself to the N and O atoms of six triazene groups forming stable five-membered rings with coordination number equal to twelve and icosahedral geometry.
Patent•
07 Aug 2020
TL;DR: In this article, a 5, 5'-triazene bridged bis(2-methyl-4-nitro-1, 2, 3-triazole) heterocyclic compound is presented.
Abstract: The invention provides a 5, 5'-triazene bridged bis(2-methyl-4-nitro-1, 2, 3-triazole)nitrogen-rich heterocyclic compound, and belongs to the technical field of synthesis of energetic materials and medical intermediates. The structure of the compound is shown as the following formula, the invention also provides a synthesis method of the compound. 4-nitro-5-amino-1, 2, 3-triazole is used as an initial raw material, 2-methyl-4-nitro-5-amino-1, 2, 3-triazole is obtained through selective methylation of active hydrogen of 1, 2, 3-triazole, then diazonium salinization and nucleophilic attack reaction are performed, and finally the 5, 5'-triazole bridged bis(2-methyl-4-nitro-1, 2, 3-triazole)heterocyclic compound is obtained. According to the method disclosed by the invention, the synthesis ofthe 5, 5'-triazene bridged bis(2-methyl-4-nitro-1, 2, 3-triazole)nitrogen-rich heterocyclic compound is realized by starting from known available raw materials through a two-step reaction, and a goodtheoretical basis and technical support can be provided for subsequent research of the compound in the fields of high-density energetic materials and medical intermediates.
01 Dec 2020
TL;DR: In this article, a novel water soluble triazene dyes based on glyco-conjugated pyrazolone amines were synthetized by using N-propyl-2-pyrrolidonium hydrogen sulfate supported on silica-coated magnetite nanoparticle as acid catalyst.
Abstract: Novel water soluble triazene dyes based on glyco-conjugated pyrazolone amines were synthetized by using N-propyl-2-pyrrolidonium hydrogen sulfate supported on silica-coated magnetite nanoparticle as acid catalyst. This organic–inorganic hybrid composite showed an excellent catalytic activity toward diazotization reaction of pyrazolone amines performing triazene dyes under solvent-free conditions in high yields. The spectroscopic properties confirmed the tendency of these dyes to exist in their hydrazo-keto tautomer forms. The study of the solubility of these dyes in water showed that their water solubility requires a minimum percentage weight of 50% of the carbohydrate part.