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Showing 1 to 20 of 71 for “"peroxides"”.
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Synthesis and Chemiluminescent Investigation of Malonyl Peroxides
The three malonyl peroxides 4-methyl-4-phenyl-1,2-dioxolane-3,5-dione (3), 4-diphenylmethyl-4-methyl-1,2-dioxolane-3,5-dione (4), and 4-methyl-4-(1-propenyl)-1,2-dioxolane-3,5-dione (5) are prepared by the methanesulfonic acid catalyzed reaction of hydrogen peroxide with the parent malonic acids. …
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Preparation and Chemiluminescence of Cyclopropyl-Substituted Malonyl Peroxides
… when the cyclopropyl-substituted malonyl peroxides, 1 and 2, are heated in the presence of added aromatic fluorescers. The chemiluminescence is explained by the activated CIEEL mechanism with the aromatic fluorescer and malonyl peroxide. A cyclopropylcarbinyl-allylcarbinyl radical …
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Metal-free syn-dihydroxylation of alkenes using malonoyl peroxides
… and reaction of chiral C2-symmetric malonoyl peroxides. The first enantioselective metal-free syn-dihydroxylation of alkenes using a peroxide reagent is reported. Chapter 6 presents preliminary investigations into a complementary antidihydroxylation protocol using cyclopropyl malonoyl peroxide …
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Evaluating the Utility of an Atmospheric Pressure Chemical Ionization Mass Spectrometer for Detecting Organic Peroxides During Beta-Pinene Ozonolysis Experiments
… was considered exclusive to protonated organic peroxides containing a hydroperoxy moiety. Given this observation, the NLS analysis mode was used to selectively detect organic peroxides formed during β-pinene ozonolysis experiments. Overall, six organic peroxide structures were proposed. Further …
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The Synthesis, Separation, and Identification of Methyl Arachidonate Hydroperoxide Positional Isomers and Their Effect as Components of Large Unilamellar Vesicles on Vesicle Calcium Ion Uptake
… It has been linked with in vivo aging and peroxides of linoleic and arachidonic acids have been associated with membrane damage.
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Free Radical Activity, Lipid Peroxidation and Antioxidant Status in Diabetes Mellitus
… atherosclerosis. Increased levels of lipid peroxides and diminished antioxidant vitamin status have been reported in diabetic patients and are also implicated in the chronic complications of diabetes. The autoxidation and glycoxidation reactions of glucose are sources of free radicals in …
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Expression of Cytosolic and Mitochondrial Superoxide Dismutases: Their Role in the Chemoresistance of Malignant Melanoma
… defense system results in accumulation of peroxides, which can act as secondary messengers to enhance cell survival pathways.
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SPECTROSCOPIC CHARACTERIZATIONS OF THE COMPOUND II INTERMEDIATE OF SOYBEAN PEROXIDASE FROM SOYBEAN SEED COATINGS
… of ferric soybean peroxidase with peroxides were studied to determine the ligand coordination and to characterize the structure of the heme active site and its intermediates (ferryl species). The lifetime, chemical reactivity and distinctive colors of the ferryl species (FeIV) …
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The role of nitric oxide in pre-eclampsia
… groups was assessed by determination of lipid peroxides and the peroxynitrite product, 3-nitrotyrosine. An improved GC-MS method was developed to quantify total fatty acids and lipid peroxides. A new reversed phase HPLC technique for the analysis of free 3-nitrotyrosine in human plasma/serum …
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Project Synthesis of N Acetyl L Histidine Ethyl Amide and Standard Operating Procedure for Fractional Collector
… histidine side chains gives rise to semi stable peroxides on exposure to singlet oxygen these oxidized structures are studied with low temperature NMR. These peroxides or species derived from them have been postulated as key intermediates in subsequent reactions such as cross linking of oxidized …
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Synthesis and reactivity of Gold(ΙΙΙ) complexes with pincer ligands
… their reactivity, we found that gold(III) peroxides can be converted into gold(III) hydrides via successive phosphine mediated oxygen transfer reactions. Since this type of reactivity was not known for any other metal, kinetic investigations are presented. We show that in contrast to …
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Synthesis, Characterization, And Properties Of Peroxo-Based Oxygen-Rich Compounds For Potential Use As Greener High Energy Density Materials
… are the only well-studied highly energetic peroxides. However, due to their high impact and friction sensitivities, low thermal stabilities, and low detonation velocities they have not found any civil or military HEDM applications. </p> <p> In this dissertation research, we have synthesized …
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The effect of the reducing agent triphenylphosphine on arachidonic acid metabolism by prostaglandin H2 synthase
… (TPP) is known to reduce hydro peroxides to alcohols and is used in the present study to ascertain the extent to which hydroperoxides in arachidonic acid preparations and in PGHS contribute to enzyme activity. Incubation of PGHS with arachidonic acid that was treated with …
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Chemiluminescence From the Thermal Decomposition of 1,4-Diphenyl-1,4-Dioxa-2-Benzopyran-3-One. Direct and Indirect Luminescence Involving an Ortho-Xylylene Peroxide
… of a new class of compounds we call o-xylylene peroxides. The other intermediate remains unidentified. The chemiluminescence in the presence of fluorescers is explained by the CIEEL mechanism with the fluorescer and the o-xylylene peroxide as the reactive species.
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Functional application of iron-based metallic glasses in catalysis technology: Design and mechanism
… effects of catalyst dosage, dye concentration, peroxides concentration, light intensity and pH on dye degradation efficiency are fully discussed. The production of high redox radicals, such as hydroxyl radicals (•OH) and sulfate radicals (SO4•−), is investigated by quenching experiments. Total …
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The synthesis of peroxyesters
… well as the peroxyesters formed, other organic peroxides too were prepared or purified and analysed. This thesis also provides IR, and 'H and 13 C NMR spectra of high resolution previously unseen, together with details of a new route to peroxyester synthesis and new compounds.
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Chemical vapor deposition of organosilicon composite thin films for porous low-k dielectrics
… precursors were used, with oxygen and hydrogen peroxides oxidants respectively, to deposit low-k organosilicon films. FTIR, nanoindentation, ellipsometry, and dielectric constant measurements were demonstrated as a valuable film characterization tools to understand structure-property-processing …
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Nonalcoholic steatohepatitis (NASH) : animal studies of interactive hepatoxicity
… Elevated liver enzymes, altered levels of lipid peroxides, and increased cytochrome P450 activity recorded in this study, suggest alcohol may exacerbate nonalcoholic fatty liver disease. The second line of inquiry is an exploration of the role of Tumor Necrosis Factor alpha (TNFα, a cytokine …
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