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 study examines modification of isotactic polypropylene to improve low-temperature resistance without substantially reducing mechanical strength. The authors introduce alkaline sulfate lignin under processing conditions as a presumed cross-linking agent, together with dioctyl sebacate as a plast…
This paper examines the synthesis and acid-catalyzed isomerization of a tertiary beta-acetylenic alcohol bearing a cyclopentadienylmanganese tricarbonyl substituent. The alcohol, 4-hydroxy-4-methyl-2-hepten-6-yn-2-yl-2-cyclopentadienylmanganese tricarbonyl, was prepared by reaction of a manganese tr…
This paper examines how ionic radius and charge influence the extraction and separation order of rare-earth and actinide nitrates in tributyl phosphate systems. It argues that the positions of ions in extraction separation series can largely be explained by the relative stability of their solvates, …
This study examines how foreign solid particles act as nucleating agents during crystallization of isotactic polystyrene. Experiments with inorganic oxides, organic crystals, and treated fibers show that nucleating activity depends strongly on polymer wetting of the foreign surface, while correspond…
This study examines catalytic routes for synthesizing piperazine from monoethanolamine, with attention to catalyst selectivity, reaction conditions, and suitability for a continuous process. A range of dehydration and hydrodehydrogenation catalysts, supports, promoters, temperatures, ammonia ratios,…
This study examines the dynamic absorption of ammonia and chlorine by ion exchange resins, using KU-2 cation exchanger in the hydrogen form and AV-17 anion exchanger in the carbonate form. Experiments measured dynamic activity as a function of resin moisture content, gas concentration and velocity, …
This paper examines whether recrystallization of a solid phase can disturb equilibrium in a heterogeneous system containing a microcomponent distributed between crystals and saturated solution. Starting from the Berthelot-Nernst distribution law, the authors derive a differential expression for micr…
This article examines the nature of adhesive bonding between polymers, responding to claims that strong polymer adhesion can be explained by purely surface chemical or physical interactions. The authors review arguments concerning temperature, contact time, molecular mobility, vulcanization, surface…
This study examines selective electrochemical isolation of the metallide phases Ni3Al and Ni3Nb from a two phase alloy of the Ni3Al, Ni3Nb system. Anodic polarization measurements in several electrolytes were used to select conditions for differentiated dissolution, followed by microchemical determi…
This study extends systematic measurements of the absorption spectra of ferrocene derivatives to the 180 to 600 mµ region, including alkyl esters of ferrocenecarboxylic and 1,1′-ferrocenedicarboxylic acids, and compares them with alkyl and acyl derivatives. Spectra were recorded in isooctane using p…
This study examines how ethylene oxide and amines affect chain transfer in the telomerization of ethylene with carbon tetrachloride initiated by iron compounds in the presence of isopropyl alcohol. The authors compare product distributions under different initiating systems and additives, using gas …
This paper examines the relation between low-frequency Raman spectra and melting temperatures in normal primary alcohols from C2 to C12, with particular attention to the role of hydrogen bonding. Using literature Raman frequencies and melting points, the authors compare n-alcohols with n-paraffins a…
The paper reports a gas-phase electron-diffraction study of phenylmonochlorosilane, undertaken to assess how a phenyl substituent affects the single silicon chlorine bond in chlorosilane derivatives. Experimental molecular scattering and radial-distribution curves were analyzed with models for sever…
This paper examines the distributional disorder of lithium-7 atoms in amblygonite, LiAlPO4(OH,F), using quadrupole splitting in nuclear magnetic resonance spectra. Motivated by differing X-ray structural determinations of lithium positions, the authors measured angular dependences of Li-7 satellite …
This study examines the position, integral intensity, and splitting of the antisymmetric stretching band of the azido group in the infrared spectra of organic azides. Measurements across azides of several structural classes show that the band occupies a wider range, about 2100 to 2170 cm−1, than com…
The study examines the γ-radiolysis of dilute aqueous Co(III) aquo complexes, including triaquoammine and cis and trans diaquoethylenediamine salts, using measurements of pH, electrical conductivity, absorption spectra, Co(II) formation, and catalytic decomposition of hydrogen peroxide. Irradiation …
This study examines whether cobalticinium compounds, previously regarded as resistant to hydrogen substitution in contrast to addition reactions with nucleophiles, can undergo isotopic hydrogen exchange in their cyclopentadienyl rings. Cobalticinium hydroxide was reacted with deuteromethanol in the …
This paper reports the first preparation and characterization of scandium perrhenates, compounds of interest for the chemistry of scandium. Crystalline scandium perrhenate trihydrate was synthesized by reacting scandium oxide with perrhenic acid, then analyzed by chemical methods, X-ray diffraction,…
This study examines how water content in acetic acid affects hydride shifts and isomerization during solvolysis of deuterium-labeled cyclohexyl p-toluenesulfonates. By analyzing label positions in the products and comparing substrates labeled at different positions, the authors show that 1,2-hydride…
This study examines nucleophilic cleavage of phosphoamide bonds in synthetic adenylyl-(5′→N)-amino acids and adenylyl-(5′→N)-peptides by hydroxylamine. The authors show that hydroxylamine cleaves the phosphorus to nitrogen bond under acidic conditions, pH 4.5, but not at neutral or alkaline pH, libe…
This paper reexamines the sequence of product formation in the liquid-phase autoxidation of normal alkanes at moderate temperatures. Drawing on recent experimental data for the decomposition of primary and secondary alkyl hydroperoxides, it argues that the conventional Langenbeck and Pritzkow scheme…
This paper investigates the high pressure phase diagram of sulfur, focusing on the form of its melting curve and possible pressure induced phase transitions. Melting temperatures were measured in a ram type cubic multiplier, calibrated using known bismuth and thallium transitions, and combined with …
This study examines the bulk preparation of graft copolymers of styrene and epsilon-caprolactam using styrene copolymers containing N-methacryloylcaprolactam imide groups as part of the catalytic system for anionic caprolactam polymerization. Copolymers with varying imide-component contents were pre…
This paper examines how changes in liquid water structure under high argon pressure affect the radiolysis of acidic aqueous solutions. Solutions containing ferrous ions with oxygen, ceric sulfate, or hydrogen and oxygen in sulfuric acid were irradiated while saturated with argon at pressures up to 2…
This paper examines deviations from Arrhenius behavior observed in low-temperature radical photopolymerization of vinyl monomers, particularly styrene and methyl methacrylate. It argues that, while collective interaction theories are not excluded, the curvature of polymerization-rate plots can be ex…
This paper examines phase equilibria and mutual solubility in the ternary system nitric acid, water, and the butyl ester of dibutylphosphinic acid at different temperatures, motivated by the need to characterize extraction systems and possible component interactions. Using experimental phase separat…
The study investigates the sensitized photodecomposition of methyl iodide at 77 K using electron paramagnetic resonance detection of methyl radicals. Methyl iodide in inert frozen matrices was irradiated in the presence of phosphorescent sensitizers including aromatic amines, hydrocarbons, benzophen…
This study examines the thermal degradation of polymers of vinylphosphinic acid esters, motivated by the differing self-extinguishing behavior of their styrene copolymers as a function of ester group structure. The authors propose that decomposition proceeds through cleavage of alkyl ester groups wi…
This communication reports the synthesis of cobalt(III) dimethylglyoxime complexes containing one coordinated water molecule and one molecule of ammonia or an organic amine, with the general cationic form [Co(DH)2(H2O)A]+. The compounds were prepared by adding calculated amounts of amines, including…
This paper reports the preparation and characterization of several alpha-ferrocenylcarbonium salts, with emphasis on diphenylferrocenylcarbonium ferrichloride and perchlorate and ferrocenylphenylcarbonium perchlorate and tetraphenylborate. The salts were obtained from the corresponding ferrocenylcar…
This paper reports the synthesis of new aromatic polyimides from 3,3′,4,4′-diphenyltetracarboxylic dianhydride and several aromatic diamines, motivated by the search for heat-resistant polymers with improved chain flexibility. The polymers were prepared through soluble polyamidic acid intermediates …
This study examines the synthesis of phosphorus-containing polyesters through homopolytransesterification of oxymethylphosphinic acid esters, a reaction type reported as previously undescribed. Ethyl ethyl-(oxymethyl)-phosphinate, ethyl phenyl-(oxymethyl)-phosphinate, and related esters were prepare…
This study examines low-temperature photochemical dehydrogenation of alcohols sensitized by aromatic amines at 77 K, focusing on hydrogen formation as a final reaction product. Using gas chromatographic analysis, actinometry, intermittent illumination, EPR comparison, and phosphorescence lifetime me…
This study determines rate constants for elementary reactions of hydrogen and oxygen atoms with ammonia, addressing contradictory earlier data and the lack of high-temperature measurements. Using first ignition limits for hydrogen, oxygen, ammonia and carbon monoxide, oxygen, ammonia mixtures in a q…
This note develops a theoretical expression for the magnitude of the photoadsorption effect on semiconductor surfaces within the electronic theory of chemisorption, considering established adsorption equilibrium and photoexcitation of electrons from the valence to the conduction band. The authors de…
This paper examines the reaction of aqueous sodium borohydride with nickel chloride, a system important for forming nickel boride catalysts but whose product composition and formation mechanism remained uncertain. Using composition and reaction yield diagrams under continuous variation of reagent ra…
This paper examines the relation between hydrogen bond energy and the enhanced infrared absorption intensity of the A-H stretching vibration, arguing that intensity changes provide a more fundamental spectral indicator than frequency shifts. Using data for diverse intermolecular hydrogen-bonded syst…
Single crystals of Bi2[MoO4]3 obtained from oxide melts were examined by X-ray rotation photographs, goniometric sweeps, Patterson projections, and preliminary electron-density synthesis to clarify the compound’s crystal structure. The study refines the monoclinic unit-cell parameters, assigns the s…
This paper reports the synthesis and characterization of the thionylamide of diethylphosphoric acid by reaction of diethylphosphoric acid amide with thionyl chloride under anhydrous conditions. The authors substantiate the product assignment through elemental analysis, hydrolysis to the parent amide…
This paper examines additive properties of systems with multistep ligand formation equilibria and their relation to equivalent sets of single-step equilibria. It develops a partial-fraction decomposition of the average property function, including the formation function, and derives formulas for the…
This study examines the liquid phase catalytic hydrogenation of styrene and phenylacetylene on platinized platinum in 0.1 N sulfuric acid, using charging curve measurements, potentiometry, electroreduction data, gas phase analysis, and kinetic observations. The experiments compare adsorption on dega…
This study examines which radical species initiate vinyl monomer polymerization during thermal decomposition of dialkyl peroxydicarbonates. Using measurements of carbon dioxide evolution during decomposition of dicyclohexyl peroxydicarbonate in the presence of styrene or methyl methacrylate, togethe…
This study examines the preparation and properties of complex fluorides of molybdenyl and tungstenyl containing potassium, rubidium, or cesium as outer-sphere cations, a class of compounds previously much less explored than analogous uranyl salts. The compounds were synthesized from hydrofluoric aci…
This paper examines the calculation of stabilization energies for iron group ions occupying tetrahedral and octahedral sites in spinel oxides, a quantity relevant to cation distribution in ferrites. Using a point charge crystal field treatment, the authors derive general expressions for ions with di…
The paper examines how ionizing radiation energy is distributed in molecular mixtures, with particular attention to whether molecules containing pi electrons absorb energy selectively and thereby violate simple additivity rules. It compares calculated excitation and inelastic scattering cross sectio…
This study examines whether molecular hydrogen can be formed from a proton and hydridically mobile hydrogen bound to carbon, using cycloheptatriene as a hydride donor. Experiments showed that trifluoroacetic acid converts cycloheptatriene to tropylium salt and polymeric products without hydrogen evo…
This paper examines whether linear free energy correlation equations can be applied to keto enol equilibria in beta dicarbonyl compounds with normal chains. Treating the conjugated keto and enol systems, rather than an aromatic ring, as the transmitting framework, the authors compare literature equi…
This study reports a steroid transformation by actinomycetes, focusing on the microbiological introduction of a 17alpha hydroxyl group into pregnane steroids. Using Actinomyces spheroides LNGI-56 fermentations with progesterone and related substrates, the authors isolated or chromatographically iden…
This study examines reactions of o-carboxybenzoylferrocene with nucleophilic and phosphorus-containing reagents, extending earlier work on its acid-promoted transformations. Treatment with phosphorus trichloride gave a chloroanhydride-like product, characterized by elemental analysis, molecular weig…
The study addresses the difficulty of obtaining stable potentials for platinum electrodes in aqueous ferrocene suspensions, caused by the low solubility of ferrocene and interference from other redox systems. An electrode reversible to the ferricinium cation was prepared by mechanically applying a m…
