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 describes the synthesis of amino acid and peptide derivatives bearing diethyleneimidophosphoryl or diethyleneimidothiophosphoryl groups, motivated by the antitumor activity of ethyleneimine-containing phosphorus compounds and the possibility of improving selectivity through amino acid or …
This study applies broad-line proton nuclear magnetic resonance to artificially prepared calcium hydrosilicates and calcium hydroxide, systems whose hydrogen positions and lattice structures were incompletely established. Experimental absorption-derivative curves for several hydrosilicate phases wer…
This study examines the ring, chain tautomerism of beta-acetopropyl and gamma-acetobutyl alcohols in solution, compounds whose actual structures had remained uncertain and which are considered models for ketoses. Ultraviolet absorption in the 200 to 350 nm region and infrared measurements of carbony…
The study examines the reactions of 3-aminopropene-1,2-thiocarbonate and related amino derivatives with ammonia and amines at elevated temperature, where aminothioglycol formation had been expected by analogy with known thiocarbonate reactions. Experiments instead showed formation of 1-hydroxypropen…
This paper describes a method for synthesizing 1,2-disubstituted 4,6-dioxotetrahydropyrimidines from carbon suboxide and N-substituted amidines. After noting that unsubstituted amidines give N,N′-malonyl-bis-amidines rather than cyclized products, the author shows that N-substituted amidines react i…
This paper examines the frequency, temperature, and dc-voltage dependence of the resistance and effective dielectric constant of films of polymeric tetracyanoethylene complexes with metals. The authors interpret the observed semiconductor-like behavior using a heterogeneous two-layer model in which …
This study examines the low temperature polymerization of trichloroacetaldehyde as a route to chlorine-containing polymers expected to show reduced flammability and improved thermal and abrasion resistance. Using purified chloral in hexane under dry argon, the authors compared organometallic catalys…
This study examines the thermal decomposition of solid nitrosyl perchlorate, focusing on the previously uncertain composition of the solid phase during reaction. Nitrosyl perchlorate was decomposed in vacuum at controlled temperature, with interrupted experiments used to analyze solid residues and c…
This study examines the tuberculostatic activity and acute toxicity of newly synthesized derivatives of unsaturated aldehydes and ketones in the 5-nitrofuran series, comparing them with isoniazid and streptomycin. In vitro serial dilution tests were performed on sensitive and drug resistant strains …
This paper examines whether the steep current rise observed during cathodic polarization of unbuffered lanthanum chloride solutions reflects an autocatalytic electrode process. Using direct and reverse polarography at a dropping mercury cathode, instantaneous current versus time measurements, and po…
This study examines the mechanism of catalytic oxidation of propylene to acrolein and carbon dioxide over a cuprous copper catalyst under conditions close to those used for acrolein synthesis. Using carbon-14 labeled acrolein and propylene in a flow reactor, the authors compared product radioactivit…
The study examines polymerization of 4-phenylbutene-1 using a Ziegler-type catalytic system of triisobutylaluminum and titanium tetrachloride in hydrocarbon solution under nitrogen. Polymerization conditions were varied by temperature and catalyst-component ratio, and the resulting solid and liquid …
The study examines transformations of di(boracycloalkyl)alkanes and 1-alkoxyboracycloalkanes with methyl borate in the presence of tetraalkyldiboranes. Di-1,4-(1-boracyclopentyl)butane reacts with equimolar methyl borate to give 1-methoxyboracyclopentane in high yield, while excess methyl borate aff…
The paper analyzes rectification in a stationary binary electrolyte cell containing an ideally polarizable electrode when a small-amplitude sinusoidal current is applied. Using a perturbative treatment of the diffuse layer and the transport equation for ionic motion, it derives the mean potential sh…
This paper describes a gas chromatographic method and apparatus for absolute determination of gas and vapor solubility in low volatility and highly volatile liquids through measurement of distribution coefficients in the Henry’s law region. The authors propose sealed, weighable columns with self sea…
This study examines the surface tension of binary alkali silicate melts, including previously unmeasured rubidium and cesium silicate systems, over alkali oxide contents of about 16 to 45 mol.%. Using an improved drop-weight method, the authors compare these melts with earlier data and evaluate temp…
This paper examines how intramolecular mutual influence in complex molecules can appear not only through changes in diagonal bond force constants, but also through off-diagonal force coefficients coupling different internal coordinates. Using infrared and Raman spectral data and approximate frequenc…
This study investigates the radiolysis of aqueous solutions of several rhodium salts under irradiation by 0.8 MeV electrons, with attention to the conditions under which metallic rhodium is formed. Solutions of rhodium chloride, sulfate, nitrate, perchlorate, and monochloropentaamminerhodium chlorid…
This paper examines the structure of the unstable uranyl nitrate nitrogen dioxide complex traditionally formulated as UO2(NO3)2·2NO2, for which several arrangements of nitrogen dioxide or dinitrogen tetroxide were possible. The authors use Gouy magnetic susceptibility measurements and infrared vibra…
This paper examines why molecular oxygen intensifies chemiluminescence in radical reactions, despite its known quenching role in photoluminescence. Using the thermal decomposition of azobisisobutyronitrile in hydrocarbon solutions, the authors compare chemiluminescence under oxygenated and oxygen-de…
This study investigates the direct formation of hydrogen cyanide from methane and ammonia during rapid adiabatic compression, with argon used as an inert diluent after nitrogen-containing mixtures failed to produce detectable HCN. Experiments with several methane, ammonia, and argon mixtures up to 1…
This paper reports synthetic routes and reactivity studies for little-studied polyfluorinated aliphatic azo compounds. The authors prepare polyfluoroazoalkanes and derivatives by reduction of azoxy compounds, oxidation of hydrazo compounds, fluorination of azines or polyfluorocarboxylic acid nitrile…
This paper examines the mechanism of nickel electrodeposition from acidic nickel sulfate solutions with particular attention to the role of electrode surface passivation. By comparing overvoltage relative to stationary and equilibrium potentials over a wide temperature range, and by analyzing polari…
This study examines the mechanism of chain initiation in the liquid phase oxidation of n-decane, testing whether radical formation proceeds through a bimolecular hydrocarbon oxygen reaction or a trimolecular process involving two hydrocarbon molecules and oxygen. The authors used an inhibitor method…
This study examines the structure of associated aliphatic organolithium compounds in solution, focusing on the assignment of infrared absorption bands to C-Li groups and to groups involved in aggregation. Infrared spectra of isotopically substituted compounds, including lithium-6 and deuterated ethy…
This study examines catalytic hydrogenation routes from 2-substituted indandiones-1,3 to the corresponding indandiols-1,3, compounds related to medicinally important indandione anticoagulants. Using skeletal nickel catalyst in alcoholic solution, the authors hydrogenated 2-benzylideneindandione-1,3 …
This study examines the addition of acid esters of phosphorus acids to unsaturated polyesters derived from maleic anhydride and various glycols, a reaction class previously little explored for such polymers. Using sodium methylate as catalyst, the authors reacted dialkyl phosphorous, thiophosphorous…
This paper investigates adsorption of 1-methylcyclohexene-1 from n-heptane solutions on alumina at elevated temperature, with attention to conditions relevant to chromatographic separation and heterogeneous catalysis. The authors develop an ampoule method that separates the equilibrium solution from…
This paper analyzes quantitative relationships between structure and reactivity for the alkaline hydrolysis of several series of aromatic sulfonic acid esters, using literature rate constants for substituted phenyl, benzenesulfonyl, diaryl, and ethyl benzenesulfonate derivatives. The authors apply m…
This study examines preferential chemical interaction between nickel and manganese in ternary copper-based solid solutions, using the Cu-Ni-Mn system where the NiMn compound has limited thermal stability. Alloys along sections intersecting the quasibinary Cu-NiMn section at 90 and 95 atomic percent …
This study examines complex formation between several chlorosilanes, including methyltrichlorosilane, trimethylchlorosilane, phenyltrichlorosilane, and silicon tetrachloride, and a range of alkali, ammonium, and tetrasubstituted ammonium halides. Interactions were assessed by chemical analysis, visu…
This study examines complex formation between tetravalent uranium and nitrate ions in hydrochloric, nitric, and mixed acid media, using spectrophotometry, ion exchange, and preparative isolation. It finds stepwise formation of lower cationic and neutral nitrate complexes at nitric acid concentration…
This study examines the state and bonding of water sorbed on low-temperature calcium hydrosilicate, focusing on the interpretation of a characteristic dehydration isotherm section near relative vapor pressure 0.35. Proton nuclear magnetic resonance spectra were measured at room temperature for sampl…
This paper examines how the transfer coefficient alpha may be estimated from the dependence of electroreduction kinetics on electrode potential and supporting electrolyte concentration, emphasizing the role of double layer corrections. Using corrected Tafel representations based on the Frumkin, Flor…
This study examines potentiometric measurement of powdered catalyst potentials during catalytic hydrogenation in dielectric organic media, where high resistance and static charge complicate conventional methods. The authors designed and tested two variants of a measuring electrode with a conducting …
This study examines chloromethylation as an electrophilic substitution reaction of 5,6-disubstituted 2-pyrones, extending earlier work on the reactivity of the 2-pyrone ring. Using mixtures of chloromethyl and bis-chloromethyl ethers, or formalin saturated with hydrogen chloride, the authors prepare…
A semiclassical formulation is developed for electron exchange reactions between ions in solution, treating the electron quantum mechanically while representing solvent motion classically. By reducing the solvent reorganization problem to an effective one-dimensional oscillator coordinate, the analy…
This paper examines the synthesis of vinyl chloride by high-temperature chlorination of ethylene in a fluidized bed, motivated by the difficulty of promoting substitution chlorination while limiting destructive chlorination and by-product formation. The authors carried out experiments at 450°C using…
This paper reports experimental observations on rearrangements of dimethylcyclosilazanes involving changes in the silicon-nitrogen ring framework. Hexamethylcyclotrisilazane was treated under several conditions, including trimethylchlorosilane with ammonia, ammonium chloride, triethylmethylammonium …
This study examines isotopic hydrogen exchange in cyclopentadienylmanganese tricarbonyl as a means of comparing its electrophilic reactivity with that of benzene and previously studied metallocene systems. Exchange experiments were carried out in acidic media containing deuterated trifluoroacetic ac…
The study examines regularities in the infrared and Raman vibrational spectra of several organosilicon and related organoelement compounds containing vinyl or allyl C=C bonds. Spectra were measured for methylchlorovinylsilanes, methylchloroallylsilanes, trimethylsilyl alkenes with varying methylene …
This paper examines complex compounds formed by rhenium with thiourea in hydrochloric acid media, extending earlier work on the yellow-green analytical complex. By varying acid concentration and the molar ratio of perrhenic acid to stannous chloride, the authors identify at least four colored comple…
This paper examines the magnetic susceptibility and stereochemistry of trivalent molybdenum complexes with urea, thiourea, and related derivatives. Measurements on nine compounds distinguish mononuclear complexes, which show magnetic moments close to those expected for three unpaired electrons, from…
This paper examines the conditions for maintaining a stationary directed electrochemical process in irradiated sulfuric acid solutions containing water radiolysis products. The authors argue and experimentally show that a single platinum electrode, even when selective toward radiolysis products, can…
This study examines the addition of nitrosobenzene to 2-substituted conjugated dienes, specifically isoprene and 2-methoxybutadiene-1,3, in the context of diene synthesis leading to substituted 3,6-dihydro-1,2-oxazines. The structure of the isoprene adduct was established by reductive cleavage to an…
This paper proposes vacantochromatography, a variant of chromatography in which a pulse of carrier gas creates a moving vacancy in a sorbed layer rather than introducing a sorbed sample band. The authors argue from chromatographic dynamics that, in the linear sorption region, vacancy motion and spre…
This paper investigates the reported formation of liquid columns with anomalous properties in narrow glass capillaries, focusing on whether their structure-sensitive viscosity differs from that of ordinary bulk liquids. Using pressure-driven motion of microscopic columns and Poiseuille-type analysis…
This paper reports the synthesis and preliminary characterization of fluorine-containing divinylbenzenes, a class not previously described by the authors as polymerizable analogues of divinylbenzene. The work uses low-temperature lithium halogen exchange on p-bromo-alpha,beta-difluoro-beta-chlorosty…
The study examines how X-radiation affects the anodic oxidation of ethanol on a smooth rotating platinum microelectrode in acidic solution, focusing on whether radiolysis products alter the electrode process. Polarographic measurements were made during and after irradiation under oxygen-deficient an…
This paper examines whether thermodynamic, or phi, potentials can be measured for a dielectric mineral surface and used to study flotation-related adsorption phenomena. Using calcite as a model nonconducting mineral, the authors constructed a thin-section calcite electrode analogous to a glass elect…
