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 potential functions of the methylchlorosilane series (CH3)nSiCl4-n, for n from 1 to 4, a set for which detailed force field analysis had previously been limited. Using published infrared and Raman spectra, together with earlier results for methylsilanes, the author calcul…
This paper reports experimental measurements of the enthalpy of molybdenum from about 700 to 2337 degrees Celsius, extending available data for this refractory metal beyond the previously studied range. The authors used a mixture-method calorimetric apparatus with a massive calorimeter and isotherma…
This paper extends the quasi-stationary theory of thermal explosion to forced dynamic regimes in which the ambient temperature rises linearly with time, rather than remaining constant or changing through reaction self-acceleration. Starting from heat balance and conversion equations, the analysis fo…
This study examines the synthesis of alpha-furylnitroethylene and its capacity to form heterocyclic nitro-containing polymers, a class described as insufficiently investigated. The monomer was prepared by condensation of furfural with nitromethane in the presence of an anion-exchange resin, giving y…
This article proposes a coordination-chemical interpretation of the extraction behavior of inner-complex compounds, relating extractability to whether the central metal atom is coordinatively saturated or unsaturated. It argues that coordinatively unsaturated complexes usually retain coordinated wat…
This paper investigates the isomerization behavior of 2-bromo-3,3-dichlorobutene-1, prepared from 1-bromo-3,3-dichlorobutane through dehydrobromination, bromination, and further elimination. The compound is shown to isomerize on standing or under ultraviolet irradiation to 1-bromo-2,3-dichlorobutene…
This paper examines chemical reactions carried out in a chromatographic regime, where differential distribution of reactants, products, or impurities between phases causes their separation during flow through a reactor. Using a pulse introduction model and assuming mass exchange is faster than react…
This study compares the effects of several forms of radiation on the catalytic dehydration of n-decyl alcohol over high-purity aluminum oxide. Alumina catalysts were irradiated in a reactor with neutrons and gamma rays for different durations, modified by introducing radioactive cerium-144 chloride …
This study examines the interaction of selected rare-earth elements with dibutyl phosphate and evaluates its use for extractive separation. Using distribution measurements, fractional extraction, isolation and analysis of solid compounds, solubility experiments in carbon tetrachloride, conductivity …
This study examines the mechanism of mutual dissolution and phase redistribution in Au-Pt alloys containing 10 and 25 at.% Pt, using successive quenching, X-ray diffraction, density measurements, and microhardness testing. The results show that dissolution proceeds periodically through the formation…
This study examines how beta radiation from yttrium isotopes affects the dissolution and apparent solubility of yttrium oxide, which hydrates in water to yttrium hydroxide. Radioactive yttrium oxide preparations containing Y-90 or Y-91 over a range of specific activities were prepared under identica…
This paper examines radiation-thermal cracking in liquid hydrocarbon mixtures, using gas-oil fractions irradiated at elevated temperatures in evacuated quartz ampoules. The authors distinguish three regimes of decomposition and show that above a critical temperature near 600 K the radiation-chemical…
This paper addresses difficulties in preparing cis-diamine platinum compounds from potassium chloroplatinite, where reactions with free amines often give Magnus salt analogues or hydrolysis products instead of the desired complexes. The authors propose replacing potassium with sodium to form concent…
This paper addresses the need for a degradation method that can determine the position of carbon-14 labeling in the benzene ring of toluene, in order to study migration mechanisms in monosubstituted aromatic compounds without the perturbing influence of a second substituent. The authors propose redu…
This study examines the photoreduction of methylene blue, azure I, and thionine adsorbed on weakly scattering aqueous silica sols, using visible and ultraviolet absorption spectroscopy under vacuum illumination and subsequent oxidation by air or ferric ions. The experiments show that methylene blue …
This study examines how radioactive radiation emitted by solids affects the surface structure of potassium, magnesium, and barium sulfates and molybdenum anhydride, motivated by earlier observations of altered sorption, solubility, isotope exchange, and catalytic behavior. Using electron microscopy …
This paper examines the polarographic electroreduction of simple hydrated nickel ions and nickel complexes with pyridine, thiocyanate, and imidazole at a mercury electrode. Using Frumkin’s electrode kinetics and the De Ford and Hume treatment of complex formation, it argues that reduction of complex…
This paper examines regularities in interatomic distances for halide molecules of the form AXn, where the central atom belongs to a given group or subgroup of the periodic system and the ligand atoms are halogens. Using available gas phase structural data, the authors arrange related halides into se…
The study examines the reaction of 1,1-dimethylsilicacyclopentane with aluminum halides as an extension of previously observed organosilicon polycondensations involving hydrocarbon bridges between silicon atoms. The authors show that aluminum bromide or chloride induces vigorous polymerization throu…
The study examines the solubility of nitrogen in liquid manganese, addressing discrepancies among earlier reported values and the experimental difficulties caused by manganese vaporization in hot-volume methods. The authors used a dynamic equilibrium method with nitrogen or nitrogen-hydrogen gas mix…
This study examines the mechanism of anodic ozone formation from sulfuric acid and bisulfate solutions, using oxygen 18 labeling to trace the sources of oxygen in ozone, anodic oxygen, water, sulfate, and added peroxy compounds. Electrolysis experiments with labeled water, labeled sulfate, concentra…
This study examines rearrangements of radicals formed during benzoyl peroxide initiated homolytic addition of hydrogen bromide to polyhaloalkenes containing dichloromethyl or dichloromethylene groups adjacent to the radical center. Addition reactions of several dichloroalkenes were carried out, prod…
The paper examines hydrogenation of unsaturated compounds under near equilibrium conditions achieved by slow, uniform feeding of substrate into the reaction vessel. Using sodium maleate, sodium o-nitrophenolate, and dimethylethynylcarbinol in alkaline and alcoholic media, the authors compare reactio…
A graphical method for determining densest lattice packings of plane figures is applied to the molecular layers of nickel dimethylglyoximate, using a planar molecular model derived from standard bond lengths, angles, and intermolecular radii. The calculation considers layer cells containing one or t…
The study examines the lead selenite, lead oxide system in order to clarify the composition and stability ranges of lead oxyselenites previously observed during oxidation and decomposition reactions. Mixtures prepared from purified lead selenite and lead oxide were equilibrated by annealing and inve…
This study examines the catalytic dehydrogenation of five- and six-membered cyclanes over activated birch charcoal at elevated temperatures. Cyclopentane, methylcyclopentane, cyclohexane, and methylcyclohexane were passed over wood activated carbon under varied temperature, pressure, and feed-rate c…
This study applies fluorine-19 nuclear magnetic resonance to characterize structural changes in perfluorooctadiene and perfluorododecadiene after cobalt-60 irradiation, comparing spectra with those of unirradiated samples. Chemical shifts, measured relative to trifluoroacetic acid, are used to assig…
This study addresses the difficulty of separating and monitoring cerebroside fractions, for which paper chromatography and earlier column methods gave insufficient resolution. The authors develop thin-layer chromatography on silica gel using anhydrous chloroform and methanol systems, then apply it t…
This study examines the stability of chloride acido-complexes of selected fourth-period elements in hydrochloric acid solutions using anion-exchange behavior as an indicator of complex formation. Distribution coefficients and sorption percentages were measured for Ti(IV), Mn(II), Fe(III), Co(II), Ni…
Carbon monoxide adsorption on palladium films and palladium supported on Aerosil was studied over a wide temperature and pressure range using adsorption measurements and infrared spectroscopy. The adsorption data show rapid uptake with two coexisting components: strong irreversible adsorption, which…
This study examines how hydroxide concentration and alkali cation identity affect oxygen overvoltage at a smooth nickel anode in purified KOH, NaOH, and LiOH at 25 degrees C, over current densities up to 1 A/cm². Polarization curves corrected for ohmic drop show wave-like behavior with distinct kine…
This study examines the oxidation of diisopropylmercury, a secondary organomercury compound, by atmospheric oxygen in isopropyl alcohol, carbon tetrachloride, and chloroform. Using carbon-14 labeled diisopropylmercury and labeled isopropyl alcohol, the authors show that oxidation in isopropyl alcoho…
This paper describes the preparation and characterization of a compound combining the indandione-1,3 and barbituric acid structural motifs, motivated by the known physiological activity of indandione derivatives and their resemblance in some effects to barbiturates. After unsuccessful attempts to cy…
This paper proposes a structural model for liquid water based on the predominance of mirror-symmetric, or cis, hydrogen bonds rather than on a disordered variant of the ice lattice. Using stereochemical constraints on bond linearity, bond length, tetrahedral angles, and maximization of cis-bonds, it…
This paper reports the synthesis of phosphorus-containing esters of acrylic and methacrylic acids, motivated by interest in element-containing acrylate and methacrylate monomers with potentially useful polymer properties. Acrylic and methacrylic acid chlorides were reacted with esters of alpha-hydro…
This study examines the polar properties and complex-forming ability of organotin chlorides, focusing on how replacement of chlorine atoms in tin tetrachloride by organic radicals affects dipole moments and donor acceptor interactions. Dipole moments were measured in hexane, benzene, and dioxane, an…
This study examines the polarity and electronic structure of pyridinium cyclopentadienylide, N-benzylpyridinium-gamma-cyclopentadienylide, and diphenylcyclopropenone through dipole moment measurements in solution. Using the heterodyne method in benzene and dioxane, and Hedestrand calculations for th…
This paper investigates a preparative route to physiologically relevant 2-aralkylindandiones-1,3 through selective catalytic hydrogenation of 2-aralkylideneindandiones-1,3. Using skeletal nickel partially modified with potassium iodide in alcoholic solution, the authors reduce the carbon carbon doub…
This study examines the structure and association of lithium alkoxides, especially lithium tert-butoxide, using infrared absorption spectra together with conductivity, dipole moment, cryoscopic molecular weight, and luminescence observations. The measurements indicate that the O,Li bond in lithium t…
This paper examines why polymerization of monomers in the solid state can occur either slowly in crystals or explosively at very low temperatures. Using thermal analysis and polarized light observations of frozen molecular mixtures of acrylonitrile or methyl methacrylate with magnesium, the authors …
The study examines how free radicals are generated at the start of liquid-phase cyclohexanol oxidation in the presence of oxygen, addressing whether initiation occurs through a bimolecular reaction or a trimolecular process involving two alcohol molecules. Using alpha-naphthol as an inhibitor, the r…
This study examines how the physicochemical nature of lubricants affects their performance during metal forming, using wire drawing of aluminum rods as the experimental method and shear stress in the lubricating layer as the main measure of lubricating action. Comparisons among hydrocarbons, alcohol…
This communication reports the synthesis and characterization of triethyltin peroxide, an organometallic peroxide of the type not previously described for tin. The compound was prepared from triethyltin oxide and anhydrous hydrogen peroxide under dehydrating conditions, and its composition was suppo…
This study examines the addition of triphenylmethyl radicals to enyne hydrocarbons and related trimethylsilyl-substituted enynes. Using triphenylchloromethane and metallic mercury under inert conditions, the authors prepared radical adducts and assigned structures chiefly from infrared spectra, elem…
This paper investigates the synthesis of 4-azafluorenone derivatives lacking an aryl substituent at position 1, with the aim of obtaining 2-carboxy-4-azafluorenones from indandione derivatives while avoiding competing cyclization. The authors develop an unsymmetrical three-carbon condensation of ind…
This study applies visible absorption spectrophotometry to determine the composition and coordination structure of cobalt chloride complexes formed in molten and crystallized systems of anhydrous cobalt chloride with alkali-metal chlorides. Thin polycrystalline films from melts containing CsCl, RbCl…
This paper examines the composition of unit cells and limiting adsorption volumes of dehydrated synthetic zeolites of types A and X, using chemical composition and X-ray structural data. It derives relations between the silica to alumina ratio and the number of oxide formula units per cubic unit cel…
This study examines the pyrolysis, photolysis, and reactions with nitric oxide of polyfluorinated nitrosoalkanes, a class whose thermal and photochemical behavior had been little explored. Experiments with polyfluoronitrosoethanes and trifluoronitrosomethane showed that heating commonly yields corre…
This study examines double oxide formation in the uranium, tungsten, oxygen system, a system for which prior data were limited to aqueous uranyl tungstates and polytungstates. Using X-ray phase analysis, the authors investigated products from reactions among uranium and tungsten oxides, vacuum decom…
This paper examines conditions under which combustion of condensed mixtures proceeds in a kinetic regime, where the burning rate is governed by chemical reaction and heat transfer rather than by mixing of components. It analyzes cases in which components can mix completely within the preparatory zon…
