SovietRxiv · Open Access in English
Rediscovering the Soviet scientific archive, in English
25357 full-text translations 14926 English PDFs 22539 abstracts
Showing 50 of 4600 papers in Chemistry
This paper examines the stereochemistry of vanadyl inner-complex compounds formed with azomethine derivatives of aromatic o-hydroxyaldehydes. Three brominated vanadyl complexes were synthesized, analyzed for composition, and studied by Gouy magnetic susceptibility measurements at room temperature. T…
This study examines intramolecular acylation and cyclization reactions of monosubstituted ferrocene derivatives, extending earlier work on disubstituted ferrocene acids. The authors prepared beta-carbomethoxypropionylferrocene, beta-carboxypropionylferrocene, omega-carboxypropylferrocene, and ortho-…
This study examines the carbon to hydrogen bond distance in crystalline paraffins, where conventional X-ray methods had limited accuracy for locating hydrogen atoms. Electron diffraction data were collected for three paraffin specimens, including C30H62 and C18H38, and Fourier and difference synthes…
This paper reports a simplified synthesis of 4-substituted 1-azadehydroquinolizinium salts, extending earlier work that required preparation and acid cyclization of condensation products from 2-aminopyridine and acylacetaldehyde acetals. The authors show that direct condensation of 2-aminopyridine w…
The study examines the gas phase interaction of ozone with methyl hydroperoxide, motivated by observed losses of methyl hydroperoxide during methane oxidation experiments in which undecomposed ozone was present. Methyl hydroperoxide was synthesized and reacted with excess ozonized oxygen in a thermo…
This study examines how nitro and amino substituents influence one another when separated by two benzene rings connected through oxygen or sulfur bridges, in comparison with directly linked biphenyl systems. The authors use kinetic measurements of acylation with p-nitrobenzoyl chloride in benzene, d…
This study examines how etherification affects the hydrophilicity of cellulose materials, using heats of wetting by water as a quantitative measure. Methylcellulose, ethylcellulose, and oxyethylcellulose prepared from cotton linters, along with methylcellulose from viscose silk, were measured in an …
This study extends hydrosilane addition chemistry to allyl ethers of 1,1,2-trifluoro-2-chloroethanol and 1,1,2,2-tetrafluoroethanol in order to prepare previously undescribed fluorosilicon-organic ethers and compare hydrosilane reactivity. Using platinized carbon catalysis in heated autoclave reacti…
This paper develops a theoretical treatment of Faradaic rectification, the constant shift of electrode potential that appears when an alternating current passes through an electrolyte. Neglecting double layer charging under appropriate frequency and concentration conditions, it models the Faradaic c…
This study examines how the structure and distribution of colloidal silicic acid fillers affect reinforcement in sodium-butadiene rubber. Samples of nearly identical chemical composition but differing reinforcing activity were compared using physicomechanical testing, alkaline leaching from rubber m…
This study examines the hydroaromatic hydrocarbons of the decalin series in the 150 to 200 degree fraction of Mirzaani oil, motivated by earlier findings of condensed aromatic hydrocarbons in the same oil. The fraction was purified, dearomatized by chromatographic adsorption on silica gel, subjected…
This study examines how the degree of molecular ordering in amorphous gutta-percha influences crystallization behavior and mechanical properties. The authors fixed different chain arrangements by vulcanizing gutta-percha under several temperature and medium conditions, then compared phase state, str…
This paper examines whether the chemisorption capacity of metals depends on sample structure, using hydrogen adsorption on nickel layers at different stages of condensation and after heating-induced recrystallization. Adsorption measurements at low temperature, compared with krypton surface-area det…
This study examines how calcium chloride affects early structure formation in aqueous suspensions of tricalcium aluminate and its hexahydrate, a problem relevant to the setting and hardening of Portland cement. Suspensions diluted with inert filler were gauged with calcium chloride solutions of vary…
This paper argues that three-center molecular orbitals, previously used to describe electron-deficient borohydrides and related complexes, may also help explain the bonding and reactivity of compounds containing three-membered rings. The authors extend the concept to protonated species such as hydro…
This paper examines how the probability of chemical reactions involving atoms with energies comparable to the activation energy can be related to the ordinary specific reaction rate. Using a Maxwellian velocity distribution and reaction cross sections for different quantum states of the target molec…
This paper presents a thermodynamic calculation for the equilibrium hydrochlorination of isobutylene to tert-butyl chloride, motivated by the practical need to select suitable reaction conditions and by limitations of earlier linear extrapolations. Using molecular geometry, moments of inertia, vibra…
Sulfur adsorption on iron from acidic hydrogen sulfide solutions was investigated in relation to the accelerating and inhibiting effects of hydrogen sulfide on iron corrosion. Using radioactive sulfur, the study measured adsorption on pure and Armco iron, examined the influence of sulfide concentrat…
This study examines the quantitative characterization of triethylaluminum prepared via ethyl bromide, including common oxidation, decomposition, and halogenated derivatives relevant to low-pressure alkene polymerization catalysts. Using quinoline complex formation in cyclohexane, the authors compare…
This study examines the true kinetic rates of ethylene and propylene absorption by aqueous sulfuric acid over a range of acid concentrations, addressing uncertainties about the reaction order and the role of acidity in olefin hydration and alkylation. Using a circulating glass apparatus at 70 °C, th…
This study examines the enzymatic synthesis of optically active peptides using glycolic and lactic acid esters of acylated racemic amino acids as acyl donors. Chymotrypsin-catalyzed reactions were tested with esters and amides of amino acids and peptides as acceptors, including optically active and …
This paper examines the synthesis of aromatic organobismuth compounds by decomposition of aryldiazonium borofluorides with freshly reduced powdered bismuth in acetone. Building on earlier organometallic syntheses through diazo compounds, the authors compare this approach with less satisfactory metho…
This study examines how molecular structure affects conjugation in unsaturated nitro compounds, a factor important for their reactions with nucleophilic reagents. Raman spectra were measured photoelectrically in acetone for a series of aliphatic and aromatic nitroolefins, nitromethane, and related a…
This paper investigates how the hydration state of silica gel surfaces affects the differential heats of adsorption of water vapor, a quantity relevant to the mechanism of elementary adsorption. Using silica gels prepared with different calcination and rehydration histories, the authors measured hea…
This study examines the nature of acidic centers in aluminosilicate cracking catalysts and their relation to cumene cracking activity. Using selective exchange adsorption with lithium and sodium acetates, kinetic measurements in a flow system, and thermometric titration of Lewis acidity, the authors…
This study evaluates the use of a rotating disk electrode for determining polarographic diffusion coefficients in solutions containing excess indifferent electrolyte. Using Levich’s convective diffusion equation, diffusion coefficients were measured for Cd2+, Tl+, Pb2+, and Zn2+ under controlled con…
The study examines how stereochemistry and ring unsaturation affect the dipole moments of methyl esters of isomeric cyclohexane-1,2-dicarboxylic acids and related cyclohexene derivatives. Dielectric constants of dilute benzene solutions were measured at 25 degrees by a heterodyne method, and dipole …
This study examines the mechanism of hydrogen peroxide formation during oxidation of 2-ethylanthrahydroquinone, tetrahydro-2-ethylanthrahydroquinone, and isopropanol by elemental oxygen. Using oxygen enriched in oxygen-18 and deuterium exchange in hydroxyl groups, the authors trace the origins of th…
This paper examines Semenov’s hypothesis that bimolecular reactions forming free radicals can have low activation barriers when the radical-forming step is nearly thermoneutral or exothermic. The authors study the reaction of triphenylchloromethane with ethyllithium in solution using electron parama…
This study examines the mechanism by which highly dispersed solid emulsifiers, specifically bentonite clay, stabilize oil in water emulsions, questioning whether selective wetting and monolayer particle coverage alone are sufficient. Emulsion stability and interfacial layer properties were measured …
This communication addresses the synthesis of soluble heterosubstituted triacidotriammine complexes of tetravalent platinum as potential substrates for resolving predicted optical isomers. The work proceeds through preparation of substituted platinum(II) triammines, oxidation to platinum(IV) triammi…
This study examines the synthesis of organomercury compounds by decomposing diaryliodonium salts and their mercuric chloride double salts with metallic reducing agents. Experiments with the diphenyliodonium chloride mercuric chloride double salt showed that mercury in water gave the best yield of ph…
This paper examines the thermal disproportionation of hydrazobenzene and substituted hydrazo compounds in the presence of hydrochloride salts of amines and weak organic acids. By heating selected hydrazo compounds under nitrogen and analyzing the resulting amines, azo compounds, recovered starting m…
This study investigates condensed-phase equilibrium in the naphthalene and thionaphthene system, a problem relevant to the purification of coal-tar naphthalene and complicated by the similar physical properties of the two compounds. Purified naphthalene and synthesized thionaphthene were examined by…
This paper examines the mechanism of electron impact dissociation in large organic molecules, challenging the view that mass spectra arise mainly through simple bond rupture. The authors synthesize n-nonane labeled with carbon 13 at the central carbon and compare its mass spectrum with that of norma…
This paper examines thallium dichromate as a precipitated compound for quantitative thallium determination, addressing earlier claims that it was unsuitable for gravimetric analysis. Using phase differential thermal analysis and systematic precipitation experiments from neutral, sulfuric acid, and n…
This study investigates kinetic isotope effects in topochemical reduction reactions of selected metal oxides with hydrogen and tritium, using gas mixtures containing hydrogen and trace HT. Reaction progress was measured from pressure decrease, while isotope composition was followed radiometrically, …
This study examines the liquid-phase products formed during gamma radiolysis of hydrocarbons, with emphasis on normal alkanes and especially heptane. Ultraviolet and infrared absorption spectroscopy were used to identify unsaturated products after irradiation in sealed, evacuated, deoxygenated ampou…
The study examines the cathodic and anodic behavior of high-purity zirconium in 1 N sulfuric acid at 25°C, with particular attention to the role of surface oxide films. Using polished, air-oxidized, and anodically oxidized electrodes under nitrogen, the authors measured open-circuit potential change…
This paper reports the preparation and characterization of trivalent cobalt dimethylglyoxime complexes containing thiourea in the inner coordination sphere, a class not previously described in the cited literature. The authors synthesize mono- and dithiourea complexes by substitution from chloro-bis…
This study examines adsorption from n-heptane solutions of selected aromatic and cyclic hydrocarbons on industrial alumina at elevated temperatures relevant to heterogeneous catalysis. Interferometric adsorption measurements for benzene, propylbenzene isomers and unsaturated analogues, allylbenzene,…
This paper describes a preparative method for synthesizing fluorene and substituted fluorene hydrocarbons by treating aryl-substituted tetrahydrobenzoic acid derivatives with phosphorus pentoxide. The authors show that phenyltetrahydrophthalic anhydride gives fluorene rather than diphenyl, and propo…
This study examines the deoxidizing ability of carbon dissolved in liquid iron under vacuum, addressing the discrepancy between thermodynamic predictions and observed behavior in vacuum melting. Experimental heats at 1590 degrees C were carried out at pressures of about 10^-2 and 10^-6 mm Hg, with p…
This study examines whether electrophilic replacement of lithium by carbon in cis- and trans-propenyllithium preserves the geometrical configuration of the olefinic radical. The authors prepared stereoisomeric propenyllithium from the corresponding propenyl bromides and reacted each with acetone, ac…
This study examines the interaction of beryllium oxyacetate with sulfur dioxide, a system expected to form weak inclusion type compounds rather than ordinary coordination complexes. Composition and vapor pressure isotherms between about minus 10 and minus 30 degrees Celsius were measured with a tens…
This paper investigates whether polymers can be prepared that remain soluble in organic solvents while being infusible, a combination presented as contrary to the usual relation between solubility, melting, and molecular structure. The authors synthesize polyalumophenylsiloxane and polyalumoethylsil…
This paper describes the use of ethoxyisoprene as a reagent for synthesizing polyene aldehydes of the isoprenoid type, extending earlier applications of vinyl ethers to carotenoid-related aldehyde synthesis. The authors show that acetals, exemplified by dimethylacrolein aldehyde acetal, add to ethox…
This study examines the phase composition, magnetic properties, adsorption behavior, and catalytic activity of two unused iron-carbon catalysts prepared on activated carbon and generator dust supports. X-ray diffraction, magnetic susceptibility measurements, thermomagnetic analysis, adsorption of to…
This paper investigates the vulcanization network structure of carboxyl-containing divinylstyrene rubbers cured with thiuram and metal oxides of magnesium, calcium, and zinc. Using equilibrium swelling measurements in benzene and in benzene containing acetic acid, interpreted through the Flory-Rehne…
This paper examines whether components of Ziegler catalyst systems can alter the stereochemical structure of already formed natural rubber, rather than only affecting monomer addition during polymerization. Solutions of milled natural rubber in dry benzene were treated under argon with titanium tetr…
