Transformations of peroxide olefin ozonolysis products under the action of hydroxylamine and semicarbazide hydrochlorides in isopropyl alcohol

Hydroxylamine and semicarbazide hydrochlorides were shown to be efficient as reducing agents toward peroxide products of ozonolysis of various olefins with different degrees of substitution. The rate of the transformations aldehyde → aldehyde oxime → nitrile → ester upon treatment of peroxides with hydroxylamine hydrochloride in isopropyl alcohol was lower than in methanol.     

Chemiluminescent Method for Determination of Rate Constants for Reactions of Triplet Aromatic Nitrenes

It has been shown that the chemiluminescence accompanying the deoxygenation of nitrosobenzenes with triphenylphosphine can be used to measure the rate constants of reactions of the intermediates triplet nitrenes with the system components nitroso compounds and triphenylphosphine.     

A radioanalytical technique to study the behavior of organic toxicants applied to a study of the photodegradation of 2,3,7,8-tetrachlorodibenzo-p-dioxin

A general method for tritium labeling of organic compounds by the use of thermal activation of tritium is described. It allows obtaining uniformly tritium-labeled organic compounds with high specific activity (up to 50 Ci/mmol) which permits tracing the majority of the biodegradation products of compounds studied. More than 40 compounds were labeled using this simple, rapid and inexpensive method. Separation of the biodegradation products is performed by thin layer chromatography. Quantification is performed by direct measurement of the radioactivity by liquid scintillation counting after transfer of the layer from TLC plates into scintillation vials, or by densitometry of autoradiographs. The technique is useful for a wide range of organic compounds, including ones with unknown structure, and can be applied to various in vivo and in vitro studies.     

Mechanism of catalytic cycloboration of α-olefins with boron trichloride: the synthesis of hardly obtainable boriranes and the mechanistic DFT study of transmetalation of titanacyclopropane intermediates

A theoretically justified mechanism of transmetalation of 2-alkyl substituted titanacyclopropanes with BCl₃ is proposed based on the DFT calculations of the thermodynamic and activation parameters of possible reaction pathways. Based on the data obtained, phenyl- and alkyldichloroboranes were proposed to be used as transmetalating agents along with BCl₃ in the catalytic cycloboration in the presence of Cp₂TiCl₂ and Mg metal. It was shown that the barely accessible 1-phenyl-2-hexylborirane can be synthesized using PhBCl₂.     

Mathematical simulation of two-phase fluid flow through a water-flooded porous reservoir with sediment formation

The results of numerical investigations of the problem of flow through a porous reservoir in the process of its water flooding with addition of a sediment-forming component are given. The mathematical model is based on the mass conservation laws for each of the considered phases and components supplemented with the equations of motion and constitutive relations necessary to close the system of equations. In solving the problem, an empirical dependence of the sediment formation intensity on the content of the sediment-forming component in the aqueous solution with allowance for variation in the effective porosity of the medium is used. The main features in solving the sediment-formation problem are distinguished using the empirical dependence and a contrastive analysis of the effect of choosing this dependence on the solution results is carried out. It is shown that the neglect of the experimental results in the mathematical formulation can lead to not only unjustified overestimated results in realizing the method but also give a distorted pattern of the entire process of sediment formation in fluid flow through a water-flooded porous reservoir.     

Inhibitor of Acid Corrosion

A new inhibitor for steel protection in sulfuric acid solutions, 2'4'6-tribromo-m-phenylenediamine'was studied.