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Showing 1 to 20 of 20 for “"1,4 benzoquinone"”.
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Examining Altered NF-κB Signalling Following 1,4- Benzoquinone Exposure in HD3 Cells
… were to determine if ROS and p38-MAPK mediate benzoquinone (BQ) induced changes in NF-κB activity, and if downstream targets of NF-κB are altered after BQ exposure. HD3 chicken erythroblast cells were transfected with either a c-Myb or an NF-κB luciferase linked reporter plasmid and exposed to …
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Study of the mechanism of cyclisation in the preparation of dioxazines and developments of synthetical methods based upon the results
… purification of 2,5-dianilino-3,6-dichloro- 1,4-benzoquinone, 2,5-dianilino-3-chloro-1,4-benzoquinone, and 2,5-dianilino-l, 4-benzoquinone was carried out and these products were subjected to various thermal experiments. The technique of thin layer chromatography was developed and proved a …
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Studies of 1,2-quinone monooximes and their metal complexes
… 5-alkylamino and 5-acylamino substituted 1,2-benzoquinone monooximes was systematically studied. Thus, It has been found that 5-amino-1,2-benzoquinone-2-oxime (5-AqoH), 5-ethylamino-4-methyl 1-1,2- benzoquinone-2-ox I me (5-Et-4-MeqoH), 5-hexylamino-1,2-benzoquinone-2-oxime (5-HxqoH) and …
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Some aspects of quinonoid chemistry
… 2 - acetyl - 3 -alkylamino - 6 - anilino - 1,4 - benzoquinones were prepared by the reaction of 2 - acetyl - 3,6 - dianilino - 1,4 - benzoquinone with alkylamines in chloroform. Irradiation of these alkylamino - p -benzoquinones with ultra-violet light gave benzoxazoles where an á -hydrogen atom …
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First steps toward the construction of a channel cell for electrochemical studies under hydrothermal conditions
… thermal stability of hydroquinone (H2Q) and 1,4-benzoquinone (BQ), a redox couple that it could be used to extend the evaluation of the CFC to higher temperatures and pressures was also investigated using UV-visible spectroscopy up to 250 ˚C at 70 bar. These studies confirmed H2Q is stable in hot …
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Molecular mechanisms and complete antigen formation in allergic contact dermatitis
… like 2,4-dinitrofluorobenzene (DNFB), 1,4-benzoquinone (BQ), 4-t-butyl-1,2-benzoquinone (tBuBQ) and cis-1,2-hexahydrophthalic-anhydride (HHPA) under physiologic conditions with nucleophilic amino acids and peptides by analytical methods (HPLC, LC/MS/MS). The new reaction products were …
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Tracking the Function and Failure of Li-Air Electrolytes using Electrochemical and Spectroscopic Methods
… and kinetic parameters of 2,5-di-tert-butyl-1,4-benzoquinone (DBBQ) as a RM in different Li-air electrolytes. Using Cyclic Voltammetry (CVs) and Electrochemical impedance Spectroscopy (EIS) the effect of ionic association is studied. The second chapter utilises 1H and 17O Nuclear Magnetic …
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Assessing fetal topoisomerase IIα as a mechanism of in utero benzene toxicity in generating double-stranded DNA damage in CD-1 mice
… exposure during pregnancy. The metabolite 1,4-benzoquinone (BQ) specifically inhibits the critical DNA repair enzyme topoisomerase IIα (topo IIα) and is hypothesized to initiate leukemias through the generation of double stranded DNA (dsDNA) breaks in hematopoietic cells. My research examines …
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Nitrosoarenes: magnetic anisotropy, donor-acceptor bonding and host-guest chemistry
… alkenes such as 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and tetracyanoethylene (TCNE). Finally, encapsulation of N,N-dimethyl-4-nitrosobenzene (DMANB) and p-nitrosocumene (p-NC) by organic host molecules such as octa-acid (OA), cucurbit[7]uril (CB7), and cyclodextrins (?,?,?-cd) in …
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Studies in Xanthone chemistry
… these systems with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone and with palladium on charcoal catalyst has been explored. Treatment of 1 -hydroxy-2,3,4,4a-tetrahydro-9H-xanthen-9-ones with lithium diisopropylamide in tetrahydrofuran afforded dianions which provided an entry to 2-functionalised …
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Enhanced Mineralization of Phenol and other Hydroxylated Compounds in a Photocatalytic Process assisted with Ferric Ions
… para-dihydroxybenzene and 1,4-benzoquinone) and carboxylic acids (fumaric acid, maleic acid, oxalic acid and formic acid). iii 7 Then, the extent of influence of Fe cations on the oxidation and mineralization rates of phenol and other hydroxylated aromatics is evaluated. It is …
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The synthesis of derivatives of naturally occurring naphthalenes
… of these antibiotics. In this synthesis, 1,4-benzoquinone was converted into 8- acetyl-5,7-dihydroxy-6-methyl-3-propionylamino-1,4-naphthoquinone in six steps in an overall yield of 20%. The key step in this reaction sequence was the introduction of the C-6 methyl group via a regioselective …
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The aqueous photochemistry of 4-chlorophenol
… analysed by HPLC. In aerated solution, para-benzoquinone is the main photoproduct together with smaller amounts of para-hydroquinone and 2-hydroxy-1,4-benzoquinone. The latter is found to be the dominant photoproduct at pH values above the pKa of 4-chlorophenol (9.4). A quantum yield for …
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Anilate-based Functional Molecular Materials with Conducting and Magnetic Properties
… 3 and 6 positions of a common 2,5-dihyroxy- 1,4-benzoquinone framework. Their electronic/structural features, coordination modes and ability to mediate magnetic exchange interactions between coordinated metal centers make them suitable candidates for the preparation of the above-mentioned …
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SPECTROSCOPIC, IMAGING, AND DOPING STUDIES OF PUSH-PULL CONJUGATED POLYMER SOLAR CELLS
… electron acceptors 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) and F4-TCNQ are investigated with absorption and Raman spectroscopies in an effort to better understand the reasons behind these performance enhancements and the preferential interactions between these dopant molecules and the …
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In vitro analysis of volatile organic compounds in search of potential biomarkers of lung cancer
… 2,4-Dimethylheptane; 2,6-di-tert-butyl-1,4-benzoquinone; 1-phenylethanol and 2-pentadecanone were released by both A549 andNHLF cell lines. The cancer cells were observed, however, to emit the VOCs at a higherlevel than the fibroblasts. Benzaldehyde; 2-ethylhexanol; hexanal and 1-nonanol …
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Surface trap passivation and characterization of lead sulfide quantum dots for optical and electrical applications
… by oxidation of under-charged Pb atoms using 1,4-benzoquinone. The density of trap states measured electrically with drive-level capacitance profiling shows that this reduces the electrical trap density by a factor of 40. In this thesis, I characterized trap states and showed that by suppressing …
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Elucidating the Role of Toxin-Induced Microbial Stress Responses in Biological Wastewater Treatment Process Upset
… (NEM), 2,4-dinitrotoluene (DNT), 1,4-benzoquinone (BQ), and Cd2+ to a bench-scale sequencing batch reactor (SBR) system. In most cases, the stressor chemicals caused significant deflocculation, as measured by an increase in effluent volatile suspended solids (VSS), at concentrations …
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New frontiers in allylic C––H amination via palladium/sulfoxideoxazoline catalysis
… coordinating sulfoxide ligands) and require benzoquinone oxidant to coordinate to Pd metal to promote the functionalization step (known as “serial ligand catalysis). This mechanism with sulfoxide ligands renders catalyst deactivation and the ability to tune the functionalization step limited. …