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Search Results (5)

Search Parameters:
Keywords = azoxybenzene

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11 pages, 1539 KiB  
Article
The Universal Scaling of Dielectric Response as a Tool in the Description of a Complex Dynamic of 4′-Butyl-4-(2-methylbutoxy)azoxybenzene (4ABO5*)
by Marcin Piwowarczyk, Ewa Juszyńska-Gałązka and Mirosław Gałązka
Crystals 2024, 14(1), 95; https://doi.org/10.3390/cryst14010095 - 20 Jan 2024
Viewed by 1381
Abstract
The results of dielectric relaxation spectroscopy of the chiral liquid crystal 4′-butyl-4-(2-methylbutoxy)azoxybenzene in the crystal phase are presented. The scaling procedure showed complex molecular dynamics and allows one to decompose the observed relaxation process into two closely located relaxation processes around the short [...] Read more.
The results of dielectric relaxation spectroscopy of the chiral liquid crystal 4′-butyl-4-(2-methylbutoxy)azoxybenzene in the crystal phase are presented. The scaling procedure showed complex molecular dynamics and allows one to decompose the observed relaxation process into two closely located relaxation processes around the short molecular axis. Temperature dependences of relaxation times characterizing flip-flop motions (rotation around the short molecular axis) and rotation around the long molecular axis are of the Arrhenius type. Full article
(This article belongs to the Special Issue Liquid Crystal Phases and Phase Transitions)
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5 pages, 619 KiB  
Communication
A Direct Method for the Efficient Synthesis of Hydroxyalkyl-Containing Azoxybenzenes
by Ekaterina S. Spesivaya, Ida A. Lupanova, Dzhamilya N. Konshina and Valery V. Konshin
Molbank 2022, 2022(2), M1384; https://doi.org/10.3390/M1384 - 14 Jun 2022
Viewed by 2091
Abstract
Reaction of nitrobenzyl alcohol with glucose (200 mol%) in the presence of NaOH in water-ethanol medium gave 1,2-bis(4-(hydroxymethyl)phenyl)diazene oxide, 1,2-bis(2-(hydroxymethyl)phenyl)diazene oxide and 1,2-bis(4-(1-hydroxyethyl)phenyl)diazene oxide in 76%, 76% and 72% yields, respectively. Full article
(This article belongs to the Section Organic Synthesis and Biosynthesis)
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6 pages, 1418 KiB  
Communication
1,2-Bis(4-(1,3-dioxolan-2-yl)phenyl)diazene Oxide
by Ekaterina S. Spesivaya, Ida A. Lupanova, Dzhamilya N. Konshina and Valery V. Konshin
Molbank 2021, 2021(2), M1224; https://doi.org/10.3390/M1224 - 1 Jun 2021
Cited by 2 | Viewed by 3491
Abstract
A simple approach to synthesizing 1,2-bis(4-(1,3-dioxolan-2-yl)phenyl)diazene oxide was developed in this study, based on glucose as an eco-friendly reductant. Full article
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9 pages, 677 KiB  
Article
Polyvinylpyrrolidone-Stabilized Iridium Nanoparticles Catalyzed the Transfer Hydrogenation of Nitrobenzene Using Formic Acid as the Source of Hydrogen
by Xinrui Zhou and Meng Zhou
Chemistry 2020, 2(4), 960-968; https://doi.org/10.3390/chemistry2040061 - 10 Dec 2020
Cited by 4 | Viewed by 5147
Abstract
Catalytic nitrobenzene reduction is crucial for the synthesis of 4,4-methylene diphenyl diisocyanate, which is used to produce polyurethane foams, thermoplastic elastomers, and adhesives. The stability and activity of nanoparticle catalysts are affected by surface ligands and stabilizers. We established the complete composition of [...] Read more.
Catalytic nitrobenzene reduction is crucial for the synthesis of 4,4-methylene diphenyl diisocyanate, which is used to produce polyurethane foams, thermoplastic elastomers, and adhesives. The stability and activity of nanoparticle catalysts are affected by surface ligands and stabilizers. We established the complete composition of 7.0 ± 1.1 nm iridium oxide nanoparticles that were stabilized by polyvinylpyrrolidone (PVP[Ir]). PVP[Ir] and its surface stabilizers were characterized using elemental analysis (EA), high-resolution X-ray photoelectron spectroscopy (XPS), powder X-ray diffraction (PXRD), FT-IR, and UV-vis spectroscopy. Notably, PVP[Ir] contained 33.8 ± 0.4% Ir. XPS binding energy analyses suggest that 7% of the Ir is Ir(0) and 93% is IrO2. Using formic acid as the source of hydrogen, PVP[Ir] catalyzed the selective hydrogenation of nitrobenzene to give aniline as the only product in 66% yield in 1 h at 160 °C in a high-pressure metal reactor. Less than 1% of the side products (azobenzene and azoxybenzene) were detected. In contrast, using alcohol as the hydrogen source led to a low yield and a poor selectivity for aniline. Full article
(This article belongs to the Section Catalysis)
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6 pages, 126 KiB  
Communication
Reduction of Nitroarenes to Azoxybenzenes by Potassium Borohydride in Water
by Yufang Liu, Bo Liu, Ailing Guo, Zhenming Dong, Shuo Jin and Yun Lu
Molecules 2011, 16(5), 3563-3568; https://doi.org/10.3390/molecules16053563 - 28 Apr 2011
Cited by 21 | Viewed by 8597
Abstract
The synthesis of the azoxybenzenes by the reduction of nitroarenes with reducing agent potassium borohydride in water was reported for the first time. PEG-400 was used as a phase transfer catalyst and could effectively catalyze the reduction. The electronic effects of substituent groups [...] Read more.
The synthesis of the azoxybenzenes by the reduction of nitroarenes with reducing agent potassium borohydride in water was reported for the first time. PEG-400 was used as a phase transfer catalyst and could effectively catalyze the reduction. The electronic effects of substituent groups play an important role in determining the reduction efficiencies. Electron-withdrawing substituents promote the formation of the azoxybenzene products, while electron-releasing groups retard the reductions to various degrees depending on the extent of their electron-donating ability. Full article
(This article belongs to the Section Organic Chemistry)
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