A5071396217- Free Radicals and Antioxidants
- Oxidative Organic Chemistry Reactions
- Enzyme-mediated dye degradation
- Collagen: Extraction and Characterization
- Synthesis and biological activity
- Analytical Chemistry and Chromatography
- Chemical Synthesis and Analysis
- Radical Photochemical Reactions
- Dye analysis and toxicity
- Photochemistry and Electron Transfer Studies
- Dyeing and Modifying Textile Fibers
- Manufacturing Process and Optimization
- Microbial Metabolism and Applications
- Chemical Reaction Mechanisms
- Corrosion Behavior and Inhibition
- bioluminescence and chemiluminescence research
- Cultural Heritage Materials Analysis
- Structural and Chemical Analysis of Organic and Inorganic Compounds
- Advanced Chemical Physics Studies
- Chemical Thermodynamics and Molecular Structure
- Inorganic and Organometallic Chemistry
- Catalysis and Oxidation Reactions
- Photopolymerization techniques and applications
- Microwave-Assisted Synthesis and Applications
- Synthesis and Biological Evaluation
Vasyl' Stus Donetsk National University
2013-2024
National Academy of Sciences of Ukraine
1994-2016
Donetsk State University of Management
2001
Institute of Physical and Organic Chemistry
1991
Russian Academy of Sciences
1986
N-oxyl radicals of various structures were generated by oxidation corresponding N-hydroxy compounds with iodobenzene diacetate, [bis(trifluoroacetoxy)]iodobenzene, and ammonium cerium(IV) nitrate in acetonitrile. The decay rate follows first-order kinetics depends on the structure radicals, reaction conditions, nature solvent oxidant. values self-decay constants change within 1.4 × 10-4 s-1 for 3,4,5,6-tetraphenylphthalimide-N-oxyl radical to 10-2 1-benzotriazole-N-oxyl radical. It was shown...
A model for predicting the rate constants of hydrogen atom transfer (HAT) from α–C–H bond p-substituted benzyl alcohols to N-oxyl radicals was proposed. To quantify factors governing reactivity both and alcohols, multivariate regression analysis performed using various combinations parameters. The based on a 2D array 35 HAT reactions, which span 4 orders magnitude. proposed polyparameter equation approximates experimental reactions with high accuracy three independent parameters: Brown...
Abstract A comparative study of N ‐hydroxy compounds – violuric acid, 1‐hydroxybenzotriazole and ‐hydroxyphthalimide as the redox mediators during laccase‐catalyzed Indigo Carmine decolorization has been carried out. It is shown that enzymatic oxidation ‐hydroxy‐mediators to radicals >N‐O • , which act a real oxidizing agent for indigo carmine, rate‐limiting stage. The effectiveness in presence laccase Trametes versicolor increases following order: < acid. main reason low activity rate...
ABSTRACT The acenaphthene oxidation with molecular oxygen in the presence of N ‐hydroxyphthalimide (NHPI) has been investigated. It is shown that main product hydroperoxide. phthalimide‐ ‐oxyl (PINO) radical generated situ from its hydroxyimide parent, NHPI, by iodobenzenediacetate. rate constant H‐abstraction ( k H ) PINO determined spectroscopically acetonitrile. kinetic isotope effect and activation parameters have also measured. On basis results our studies available published literature...
The biocatalytic system laccase/TEMPO/O2 has attracted the attention of researchers over past two decades. A variety applications for include organic synthesis, modification cellulose, and oxidative degradation environmental contaminants. rigorous predictable quantitative assessment change in enzymatic activity under influence a mediator is important such system. In this study, operative conditions carrying out model reaction synthetic dye Indigo Carmine presence Trametes versicolor...
The ability of laccases to work effectively in properly selected aqueous-organic solutions significantly expands the scope their application, making them commercially attractive and more competitive. However, it must be considered that molecules organic solvent are very aggressive towards enzymes destroy weak non-covalent interactions maintain spatial structure protein. In this work, we quantitatively described influence nature water-miscible solvents concentration on activity stability...
Abstract Kinetics of oxygen consumption, reaction product formation, and chemiluminescence during polyphenol oxidation by molecular in alkaline aqueous media with additions l ‐ascorbic acid (AscH 2 ) homocysteine (HCys) has been investigated. In these processes, AscH HCys have shown to act as typical radical‐reaction inhibitors that can be used for determinations the radical formation rates. The rates hydroquinone ( p ‐QH ), chlorohydroquinone (Cl‐QH 2,5‐dichlorohydroquinone (2,5Cl‐QH...
Abstract The oxidation of vinyl compounds such as styrene, α ‐methylstyrene, methyl methacrylate, acrylonitrile with molecular oxygen in the presence N ‐hydroxyphthalimide have been studied. It was shown that is efficient initiation oxidative polymerization monomers. products monomer at 66 °C and 1 atm O 2 are corresponding polyperoxides low carbonyl compounds. IR‐ H NMR spectroscopy confirm alternating copolymer structure –O–O– bonds main chain. In monomers initiated mixtures...