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 investigates the feasibility of separating stable silicon isotopes by rectification of monosilane, proposed as a favorable compound because of its low boiling point and relatively large isotopic molecular mass differences. Monosilane was distilled in a packed rectification column at 560 m…
This paper develops kinetic expressions for cathodic processes on semiconductor electrodes when valence-band electrons, rather than only conduction-band electrons, participate in the reaction. Starting from established semiconductor electrode theory and assuming no surface states, the authors derive…
This study examines oxidation and reduction reactions induced by ionizing radiation in nitrogen-saturated organic solutions of the methylene blue, leucomethylene blue redox pair. Using spectrophotometric measurements after x-ray and gamma irradiation in a range of purified solvents, the authors comp…
This study examines complex compounds formed by borane and phenylborane with diethylamine and describes several thermal and substitution reactions of the resulting organoboron compounds. Diethylamine-borane was prepared in high yield from diborane and diethylamine and found to be a liquid rather tha…
This study examines the anodic polarization of platinum in perchloric acid by measuring potential decay after interruption of the polarizing current, with particular attention to the potential jump observed during oxygen evolution. Decay curves recorded by oscilloscope were used to estimate electrod…
This study examines the free-radical addition of alcohols to acrylic acid and methyl acrylate as a route to gamma-lactones, using tert-butyl peroxide as initiator. The authors propose a radical chain mechanism in which hydrogen abstraction from the alcohol is followed by addition to the acrylic subs…
The study examines catalytic dehydration of dihydric alcohols on tricalcium phosphate under comparable flow conditions across a broad temperature range, with parallel tests on likely intermediates such as cyclic ethers and unsaturated alcohols. Dehydration of C4, C5, and C6 alpha, omega glycols is s…
This study examines the preparation, identification, and Raman spectroscopic characterization of isomeric octalins, focusing on cis-Δ-2,3-octalin, Δ-9,10-octalin, and mixtures containing Δ-1,9-octalin. The authors prepared octalin isomers by dehydration of cis-cis-decalol-2 under different condition…
This paper investigates the synthesis of polydimethylsiloxane polymers with a regular distribution of dimethylphosphinic groups along the molecular chain, addressing the irregular group placement typical of polymers obtained by joint hydrolysis of mixed monomers. The authors prepared alpha, omega-di…
This paper examines how the catalytic activity and selectivity of metal catalysts depend on the degree of equilibrium between surface active centers and the crystal lattice. Building on kinetic studies of allylbenzene isomerization and cyclohexene conversion on platinum, palladium, tungsten, and cop…
This study examines the formation and structure of p-dimethylaminophenylmercury derivatives of oxyazo compounds and phenylhydrazones of quinones. Reactions of p-dimethylaminophenylmercuric hydroxide with these substrates in methanol yielded crystalline arylmercury compounds in which the arylmercury …
This paper investigates critical kinetic phenomena in the liquid phase oxidation of butane dissolved in benzene at elevated temperature and pressure, using cobalt stearate to reduce the induction period and monitoring products such as acetic acid, methyl ethyl ketone, and butane hydroperoxide. Exper…
This paper reports the synthesis and characterization of beta-cedrene, a proposed minor component of natural cedrene that had not previously been isolated in individual form. Starting from alpha-cedrene derived from cedrol, the authors prepared cedrenal by selenium dioxide oxidation and converted it…
This study examines how cathodically reduced hydrogen affects the mechanical properties of rolled iron, rolled nickel, and electrodeposited matte and bright nickel. Using cathodic polarization in sulfuric acid with sodium sulfide, hydrogen diffusion measurements, bending tests, vacuum extraction, X-…
This paper reports the preparation and characterization of 2-beta-hydroxyethyl-2-phenylindandione-1,3, a homolog of previously studied 2-substituted indandione anticoagulants. The compound was synthesized by heating 2-phenylindandione-1,3 with excess ethylene chlorohydrin in the presence of potassiu…
This paper derives a general expression for the intensity of Rayleigh light scattering by anisotropy fluctuations in homogeneous isotropic molecular systems, explicitly including correlations between molecular orientations. Using the Lorentz, Lorenz relation with Einstein’s differentiation method, t…
The study examines the interaction of molecular oxygen with the stable free radical DPPH in organic solutions using electron paramagnetic resonance. Measurements of benzene solutions under vacuum, air, and oxygen show that oxygen reversibly broadens the EPR lines and reduces signal intensity, while …
Electron paramagnetic resonance was used to study the hyperfine structure of V2+ ions in VCl2 solutions, chiefly in water, at 9598 MHz over 295 to 400 K. At room temperature aqueous solutions showed a single broad line, while heating to 400 K revealed eight partially resolved hyperfine components co…
This study examines molecular compounds formed between tin tetrachloride and organic sulfides in benzene, focusing on complex composition, donor acceptor bonding, and dipole moments. Using dielectrometric titration, density measurements, cryoscopy, isolation of selected compounds, and sulfur-35 exch…
This study examines the reaction of sulfur with high-pressure polyethylene at 200 to 250 degrees C as a possible route to chemical modification and crosslinking of saturated polymers. By following sulfur uptake, hydrogen sulfide evolution, double-bond formation, gel content, and swelling behavior, t…
This paper develops an approximate theory for the quasiperiodic formation of Liesegang rings during mutual diffusion of two reacting substances that produce an insoluble precipitate. For the simplified case of diffusion in a cylindrical tube, the authors formulate dimensionless parameters, assume in…
This paper examines whether a series of solid delta-keto acids and gamma-bromo-delta-keto acids exist predominantly as open keto acids or as cyclic oxylactone forms. The authors use infrared spectroscopy, with model compounds representing carboxylic acid and open-chain structures, to compare absorpt…
The study examines the condensation of alkyl- and alkoxy-substituted oxazoles with maleimide as a more reactive dienophile than maleic anhydride. A series of reactions in benzene, toluene, or xylene afforded substituted pyridine-3,4-dicarboximides, and in some cases half-amides, with the proposed ep…
The study examines the behavior of 3-carboxy-4-carboxymethyl-5-p-chlorophenylazotropolone during boiling with 20 percent sodium hydroxide, as part of an investigation of arylazotropolone transformations. The reaction mixture was separated into several products, including p-chloroaniline and compound…
This study examines post-radiation oxidation of ferrous ions in air-saturated 0.4 M sulfuric acid solutions containing ethyl alcohol after exposure to single high-intensity electron pulses. Using spectrophotometric determination of ferric ion yields, the authors measured the time dependence of oxida…
The paper proposes a spectroscopic method for distinguishing universal and specific solvent effects on solvatochromic absorption spectra by measuring solutions in mixed solvents based on alkanes, especially hexane as a reference medium with predominantly universal interactions. Applied to keto-dihyd…
This paper investigates the heat of adsorption of hydrogen on disperse palladium electrodes and selected palladium silver alloys, using electrochemical charging curves to distinguish surface adsorption from hydrogen dissolution in the metal. Measurements were made chiefly in sulfuric acid at several…
A sesquiterpene alcohol isolated from the neutral fraction of Siberian cedar oleoresin, Pinus sibirica, was examined to determine its identity and configuration. The compound was purified by alumina adsorption chromatography, recrystallization, and vacuum sublimation, then characterized by melting p…
This paper examines whether the electronic spectrum of a polymer chain can have a band structure in the absence of periodicity or even local ordering. The author models the chain by successive rotations of equal link vectors, constructs electron wave functions as linear combinations of localized fun…
The study examines reactions of benzoyl peroxide with titanocene derivatives, motivated by the high reactivity of biscyclopentadienyltitanium and the contrasting destructive reaction reported for ferrocene. Experiments in benzene and isopropyl alcohol showed that benzoyl peroxide converts biscyclope…
This study investigates the behavior of crystallization water in ferroelectric potassium ferrocyanide trihydrate, K4Fe(CN)6·3H2O, using proton magnetic resonance on polycrystalline samples and single crystals over 77 to 400 K. Analysis of the second moment and line splitting shows that at low temper…
Polarization measurements and self-dissolution experiments were carried out on n-type and p-type germanium samples of different resistivity in acidic sulfate solutions, with hydrogen peroxide and ferricyanide as cathodic reagents. The results show that hydrogen evolution and hydrogen peroxide reduct…
This study examines gamma radiolysis of n-heptane adsorbed on oxide catalysts, comparing alumina and mixed alumina catalysts containing chromium, molybdenum, cobalt, and potassium oxides. Measurements of gas formation as a function of surface coverage show enhanced radiolysis in the adsorbed monolay…
This paper argues that certain octahedral transition metal complexes, especially those with electronic configurations such as d9, high spin d4, and low spin d7, may exist in two nonequivalent tetragonally distorted conformations: elongated and compressed octahedra. Using ligand field considerations …
This paper examines the self-alkylation of 3,5-di-tert-butyl-4-hydroxybenzylamine as a route to substituted tribenzylamines, compounds whose directed synthesis is otherwise difficult because mixtures of amines are commonly formed. The authors show that the amine can convert under mild conditions, es…
This study examines the formation and reactions of excess-energy, or hot, methyl radicals during low-temperature photolysis of methyl iodide, azomethane, acetone, and acetaldehyde in solid methylcyclohexane at 77 K. The authors combine analysis of gaseous products with electron paramagnetic resonanc…
This study examines how reaction conditions control the bromination site in higher alkyl 2-thienyl ketones, including normal and branched homologs of 2-acetothienone. Bromination without solvent in the presence of excess anhydrous aluminum chloride gave ring-substituted products, identified as 4-bro…
This study examines whether wide-pore silica gel can be modified to serve as a stable gas-chromatographic adsorbent with reduced adsorption energy and improved surface uniformity. Industrial silica gel was purified, hydrothermally treated to coarsen its pore structure, and then reacted with trimethy…
This study examines the formation and stability of cobalt and nickel selenocyanate complexes in water, methanol, and acetone, and reports syntheses of several corresponding salts. Using spectrophotometry, electrical conductivity, potentiometry, and formation-curve analysis, the authors identify solv…
This study examines the adsorption of oxygen on freshly cleaved, highly dispersed graphite prepared by vibratory grinding in an argon atmosphere, with attention to the distinction between chemical adsorption at room temperature and low-temperature physical adsorption. Volumetric adsorption and desor…
This paper addresses the equilibrium isotope effect in tritium, protium exchange among hydrogen-containing substances, a problem important for the use of tritium as a tracer. Because spectroscopic data for many tritium compounds are unavailable, the authors propose an approximate method based on a p…
This study examines ethyl radical exchange between triethylaluminum and carbon-14-labeled ethyl bromide, using radiometric analysis of ethane formed after decomposition of the organoaluminum compound. Experiments under nitrogen in sealed ampoules show that exchange is not observed without added meta…
This paper examines how the induction period of oxidation depends on antioxidant concentration, especially at very low inhibitor levels where the commonly assumed linear relation is inadequate. Using a chain oxidation model with degenerate branching and chain termination by antioxidant, the authors …
This study examines the hydrogenating properties of two metallic rhenium catalysts: rhenium supported on activated carbon prepared from a dioxane complex of rhenium anhydride, and skeletal rhenium obtained by leaching a rhenium aluminum alloy. Using autoclave, flow, and atmospheric pressure experime…
The study examines the reaction of ethylene oxide with carbon disulfide in sealed ampoules at 90 to 100°C in the presence of a quaternary ammonium bromide catalyst. The reaction gave partial conversion of ethylene oxide and produced ethylene carbonate and ethylene trithiocarbonate in an approximatel…
The study examines the structures of salts formed by the nonbenzenoid aromatic ketones diphenylcyclopropenone and tropone with strong acids. Hydrobromide salts of both ketones were synthesized and analyzed by infrared spectroscopy in the crystalline state and in solution, with attention to disappear…
This paper investigates thermodynamic properties of solid solutions in the NiFe2O4 and Fe3O4 system formed during equilibrium reduction of nickel ferrite by hydrogen at 600 to 900 °C. Equilibrium hydrogen pressures were measured from both reduction and oxidation directions, compositions were determi…
This paper investigates the ability of high molecular weight oxygen-containing polymers, specifically polyacrolein, to form coordination complexes with heavy metal salts. Powdered polyacrolein samples prepared under different polymerization conditions were tested for extraction of uranyl nitrate fro…
This study examines how representative organic and mineral tanning agents affect the structure of aqueous gelatin solutions, treating tanning as a form of protein denaturation whose mechanism involves possible spatial rearrangement and bridging. Effective viscosity was measured in a horizontal capil…
This paper examines reactions of diborane, alkylboranes, and tetraalkyldiboranes with boric, alkylboronic, and dialkylborinic esters, including thio analogues. The authors propose reaction schemes involving reversible exchange of hydrogen, alkoxy, alkyl, and alkylthio groups at boron, showing that d…
