Yu. S. Zimin

On the mechanism of phenol ozonolysis

The mechanisms of liquid-phase phenol ozonation are revised. A new mechanism in which a significant role is played by free-radical reactions is suggested for this process.

Kinetics and mechanism of the oxidation of bis(acetylacetonato)-cobalt(II) by cumene hydroperoxide in the presence of pyridine

Stoichiometric reaction of bis(acetylacetonato) cobalt(II) with cumene hydroperoxide in chloroform solutions containing added pyridine has been studied by the PMR method.AbstractМетодом ПМР изучена стехиометрическая реакция между бис (ацетилацетонатом) Co(II) и гидроперекисью кумола в растворах хлороформа, содержащих добавки пиридина.

Coordination of molecular oxygen by Co(II) β-diketonates

ESR studies have revealed coordination of molecular oxygen by Co(II) β-diketonates.AbstractМетодом ЭПР обнаружена координация молекулярного кислорода β-дикетонатами кобалйта.

Kinetics of oxidation of an arabinogalactan from larch (Larix sibirica L.) in an aqueous medium in the presence of hydrogen peroxide

The oxidation of an arabinogalactan in an aqueous medium under the action of hydrogen peroxide and dioxygen is accompanied by accumulation of carbonyl and carboxy groups in the oxidized polysaccharide macromolecules and derived oligomers. The addition of iron sulfate accelerates the radical oxidation of the biopolymer, while the addition of phenol inhibits the oxidation. The influence of the temperature and the initial H2O2 and arabinogalactan concentrations on the kinetics of the initial oxidation stage of the natural polysaccharide was studied.

SYNTHESIS AND STRUCTURE OF (PYRIDINE) BIS(ACETYLACETONATO) (1-METHYL-1-PHENYLETHYLPEROXO) COBALT(III)

Synthesis and structure of (pyridine) bis(acetylacetonato) (1-methyl-1-phenylethylperoxo) cobalt(III) complex are described.AbstractОписаны синтез и строение кумилпероксид (пиридин) бис (ацетилацетоната) кобальта(III).

Preparation and Antihypoxic Activity of Complexes of Uracil Derivatives with Dicarboxylic Acids

Water-soluble low-toxicity complexes of 6-methyluracil and its derivatives with succinic and fumaric acids were synthesized. The synthesized complexes were tested for antihypoxic activity.

Kinetics of the Reactions of Ozone with Substituted Ethylenes

The rate constants of second-order reactions of ozone with 22 substituted ethylenes in CCl4 solutions at 293 K were determined using the stopped-flow method. An analysis of the experimental results and published data demonstrated that the structure dependence of olefin reactivity can be described in terms of either the Taft equation or the Swain equation.

Kinetics of oxidation of aliphatic alcohols by ozone in aqueous solutions

The kinetics of oxidation of aliphatic alcohols by ozone in aqueous solutions was investigated in the temperature interval of 292–317 K. The activation parameters of the reaction were determined. The dissociation energies of CH-bonds of the studied substrates were calculated with the use of the AM1 semiempirical method.

Kinetics of Ketone Oxidation by Ozone in Water Solutions

The spectrophotometric monitoring of ozone consumption in a liquid phase is used to study the kinetics of cyclopentanone and methyl butyl ketone oxidation. The rate of ozone reaction with ketones (RH) at 303–344 K in acidic (HClO4) aqueous solutions is described by the equation w = k1[RH][O3] + kEn[RH][HClO4], where k1 is the rate constant for the reaction of ozone with RH and kEn is the rate constant for the enolization of RH. The kinetic parameters of the process are found.

Radical mechanism of pectin oxidation in aqueous solution

The kinetic features of functionalization of natural polysacharide, pectin, by liquid-phase oxidation were studied.