Global ETD Search
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Showing 1 to 9 of 9 for “"alkoxyl"”.
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Interactions of paraquat and nitrodiphenylether herbicides with the chloroplast photosynthetic electron transport in the activation of toxic oxygen species
… region. Potential involvement of hydroxyl and alkoxyl radicals in the peroxidative action of the p-nitro diphenyl ether herbicides acifluorfen was evaluated under laboratory conditions. Methional was added to illuminated pea thylakoids and its oxidation to ethylene was used as an indicator of …
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The Mechanisms of Sulfur-Containing Metal Complexes as Uv-Stabilisers
… polypropylene) and in model systems initiated by alkoxyl radical generators (hydroperoxides). The chemical reactions involved in the antioxidant behaviour of nickel complexes of dithiophosphoric and xanthic acids were investigated both by kinetic methods and product analysis. Two mechanisms were …
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Towards Water-Soluble Peroxyl Radial Clocks
… thermal and photolytic conditions, forming an alkoxyl and acyloxyl radical, the latter of which rapidly decarboxylates to form a carbon centered radical. While peroxyesters are generally decomposed under anaerobic conditions to serve as sources of carbon-centered radicals to initiate radical …
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Elucidation of the Various Mechanisms of Antioxidant Activity of Organosulfur Compounds
… in many H-atom transfer reactions with alkyl, alkoxyl and peroxyl radicals. The one-electron oxidation exhibited by hydropersulfides parallels the one we previously reported for sulfenic acids (RSOH). Previous successful studies on the one-electron oxidation of sulfenic acids prompted us to …
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Molecular Probes for Biologically Important Molecules: A Study of Thiourea, Hydroxyl radical, Peroxynitrite and Hypochlorous acid
… reactive superoxide is converted to peroxyl, alkoxyl and hydroxyl radicals by various enzymatic, chemical, and biochemical processes. Hydroxyl radical imparts rapid, non specific oxidative damage to biomolecules such as proteins and lipids. Superoxide also reacts with nitric oxide in cells to …
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Assessment of synthetic chalcones as cancer chemopreventive agents
… based on their chemical structures such as alkoxyl group (17 chalcones), methylene-dioxy group (13 chalcones), and methylene-dioxin group (1 chalcone). Nuclear factor erythroid 2-related factor 2 (Nrf2)- antioxidant response element (ARE) pathway play an important role in chemoprevention due …
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Methods in Total Synthesis: Development of a 2nd-Generation Synthesis of CJF-III-288, and Synthetic Efforts Towards the Total Synthesis of Sequoiamonascin A
… [1,5]-hydrogen atom transfer (HAT). An alkoxyl radical generated from the corresponding N-alkoxyphthalimide via a single electron transfer from a photocalayst, can “relay” the radical to a carbon center by intramolecular [1,5]- or [1,6]-HAT, affording a stabilized radical which captures …
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The Reaction Kinetics of Neutral Free Radicals and Radical Ions Studied by Laser Flash Photolysis
t-Butoxyl radical has been used as a chemical model for hydrogen abstractions in many enzymatic and biological systems. However, the question has arisen as to how well this reactive intermediate mimics these systems. In addressing this concern, absolute rate constants and Arrhenius parameters for …