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 structural and reactivity features of barene compounds of the type B10H10C2RR' using infrared spectroscopy, nuclear quadrupole resonance data, and selected chemical observations. The IR spectra indicate the absence of bridging B-H-B hydrogens, distinguish C-H, B-H, B-B, B-Cl, and…
This paper examines the stability and cleavage behavior of 1,2-disulfones of 3,3-dimethylbutane bearing alkyl or phenyl sulfonyl substituents, with attention to the steric influence of the tert-butyl group. The authors synthesize these disulfones by oxidation of corresponding dithioethers and study …
The study examines how confinement and surface condition affect the heat capacity of liquids in disperse systems, using nitrobenzene and benzene in contact with glass powder, silica gel, and potassium iodide powder. Heat capacities were measured between 10 and 80 degrees Celsius with an adiabatic ca…
This paper develops and applies an approximate method for estimating absolute rate constants of fast radiation chemical reactions in aqueous solutions under pulsed electron irradiation. The approach combines two kinetic treatments of dose-rate-dependent product yields: one based on stationary concen…
This study examines the thermal degradation mechanism of polyethylene terephthalate and related ester model compounds under vacuum at elevated temperatures. Molecular weight changes, volatilization kinetics, product analysis, spectroscopy, and comparisons with glycol dibenzoate and other esters are …
This study addresses conflicting views on the hydration number and geometry of copper(II) ions in dilute aqueous solutions. The authors compare electronic absorption spectra of dilute aqueous solutions of copper(II) perchlorate, sulfate, and chloride with spectra of crystalline copper aquocomplexes …
The crystal structure of racemic ammonium antimonotartrate, d,l-(NH4)2[Sb2(C4H4O6)2]·4H2O, is examined to clarify the constitution of antimony tartrate complexes and their relation to isomorphous rubidium salts. X-ray diffraction data were treated in the centrosymmetric space group C2/c using Patter…
This study examines the structure of the electrical double layer at the mercury solution interface during cathodic initiation of methyl methacrylate polymerization in sulfuric acid. Using differential capacitance measurements on dropping and hanging mercury electrodes, the authors analyze monomer ad…
This study examines how polar substituent effects influence the homolytic abstraction of alpha hydrogen atoms and subsequent radical recombination in the polyrecombination of substituted diphenylmethanes. Diphenylmethane derivatives and corresponding tetraphenylethane dimers bearing electron donatin…
This paper examines the structure of acid salts of 3-acetylpyrrole derivatives and related dipyrrylmethanes, addressing earlier proposals that their acid-catalyzed reactivity arises from pyrrolene forms with active methylene character. Using infrared spectral data for hydrochlorides prepared from ac…
This study examines the poorly characterized reactions of ortho and para benzoquinonediazides with selected metal halides and related Lewis acids, including boron trifluoride, zinc chloride, cobalt chloride, and mercuric chloride. The authors prepare crystalline products in aqueous, methanolic, and …
This study examines butadiene polymerization in benzene at 22°C using a catalytic system of an alcohol complex of cobalt chloride and diisobutylaluminum chloride, with attention to polymerization rate, polymer molecular weight, and their dependence on catalyst components and water. Using specially c…
This study examines whether the thermal decomposition of end-protected polyformaldehyde, usually yielding formaldehyde as the principal product, can also proceed through radical pathways rather than only ionic mechanisms. The authors propose possible radical intermediates and decomposition routes le…
This study examines how pH and electrolyte concentration affect hydrogen overvoltage at a dropping gallium electrode over a pH range from 1.8 to 14. Measurements in phosphate buffer, acid, alkali, and mixed sodium sulfate solutions show normal Tafel slopes in strongly acidic and alkaline media, whil…
This study examines the use of mass spectrometry for identifying isomeric oxides of bicyclic terpenes, including alpha and beta forms of Delta3-carene oxide, camphene oxide, and beta-pinene oxide. The compounds were synthesized, purified, and analyzed mainly at 50 eV, with additional low-voltage spe…
This study examines the formation and stability conditions of uranium trioxide modifications produced by oxidation of uranium oxides, oxidation of defective alpha-UO3-x, crystallization of amorphous UO3, and thermal decomposition of uranyl hydroxide and ammonium diuranate. Phase and chemical analyse…
This paper describes a pyrophosphate method for synthesizing nucleotidyl amino acids containing a phosphamide P,N bond, using nucleoside diphenyl pyrophosphates as reactive phosphorylating agents toward phenylalanine methyl ester. The authors prepare methyl esters of uridylyl, adenylyl, guanylyl, an…
The study examines how bromide anions catalyze the monomolecular isotopic exchange of p-nitrobenzylmercury bromide with radioactive mercuric bromide in dimethyl sulfoxide, where ionization of the organomercury compound controls the rate. Kinetic measurements at 18 °C with varying potassium bromide c…
This paper reports the preparation and characterization of cyclopentadienyl zirconium compounds containing a zirconoxane Zr O Zr linkage, a class previously not described. Tetracyclopentadienyldizirconoxane dichloride was obtained by hydrolysis of ethoxydicyclopentadienylzirconium chloride and, more…
This paper describes the preparation of new cyclopentadienyl dizirconoxane derivatives containing aryl or acetylacetonate groups, addressing the limited availability of zirconium compounds combining metal-carbon bonds with cyclopentadienyl ligands. Diphenyl and di-p-tolyl tetracyclopentadienyldizirc…
This paper examines how the hyperfine structure constant of electron paramagnetic resonance spectra of impurity manganese ions can be used to evaluate chemical bonding in minerals and inorganic compounds. Using new measurements on 28 natural minerals together with published data for nearly 80 compou…
A method is proposed for estimating ratios of rate constants for reactions of solvated electrons and H and OH radicals with radical acceptors in irradiated aqueous systems, avoiding the need to specify the full reaction mechanism required by competing acceptor methods. The approach uses the observed…
This study examines whether phenyl radicals undergo isomerization in free-radical reactions of diphenylmercury, using diphenylmercury labeled with carbon-14 in the 1,1′ positions of the benzene rings. The authors carried out photodecomposition in benzene and copper-assisted thermal decomposition, is…
This study examines the alkaline hydrolysis kinetics of phenyl and p-chlorophenyl beta-D-glycosides of glucose, galactose, and xylose, a class less characterized than in acid hydrolysis. Hydrolysis was conducted in 4 N sodium hydroxide at 80 degrees C and followed primarily by semimicropolarimetry, …
This paper examines the mechanism of isotopic exchange between benzylmercury halides and radioactive mercuric halide, focusing on whether structural and solvent effects can produce a monomolecular electrophilic substitution pathway. The authors study the exchange of p-nitrobenzylmercury bromide with…
This study examines free-radical reactions occurring when oxygen interacts with gamma-irradiated potassium palmitate, using oxygen sorption measurements and EPR spectroscopy over a range of oxygen pressures and temperatures. At room temperature, oxygen uptake corresponds quantitatively to the disapp…
This study examines the tautomeric structure of thiosemicarbazones of ethyl pyruvate, acetoacetic ester, and ethyl levulinate using infrared and Raman spectra, with additional ultraviolet and NMR data for the pyruvate derivative. The authors compare carbonyl and imine stretching frequencies in cryst…
This study examines how the phase state of diketene affects the chemical structure of polymers formed during polymerization initiated by magnesium. Diketene and magnesium vapors were co-condensed under high vacuum at low temperatures, and the resulting products were analyzed by infrared spectroscopy…
This study examines the relationship between configuration and boiling point order in stereoisomeric 1-methyl- and 1-ethyl-4-tert-butylcyclohexanes, a case relevant to proposed rules for disubstituted cyclohexanes. The authors synthesized the corresponding tert-butylalkylbenzenes, hydrogenated them …
This study addresses the unresolved structure of products formed in the photochemical reduction of porphyrins, focusing on whether hydrogen atoms add to central, bridge, or pyrrole-ring sites. The authors examine tetraazoporphin, whose bridge CH groups are replaced by nitrogen, using visible and inf…
This paper examines nuclear quadrupole relaxation of deuterium in molecular liquids as a means of estimating electric field gradients and quadrupole coupling constants in chemical bonds. Spin lattice relaxation times were measured by the spin echo method at 4.4 Mc/s for deuterated water, alcohols, b…
This study examines the acidity and enolization of 2-arylindandione-1,3 derivatives, compounds previously treated mainly as pseudoacids without proven enol forms. Using ultraviolet and visible spectrophotometry in water, aqueous alcohols, alcohols, acetone, dioxane, and nonpolar solvents, the author…
This paper examines carrier-gas-free frontal gas chromatography, focusing on calculation of mixture composition and on the broadening of chromatographic fronts. For ternary mixtures with linear adsorption isotherms, the authors derive two calibration-based methods for determining composition, one us…
This study examines the role of stearic acid in the polishing of aluminum using carbon-14 labeled stearic acid as a radioactive tracer. Duralumin specimens were polished with a chromium oxide paste containing labeled acid, then subjected to radiometric measurement, solvent extraction, hydrolysis, el…
This study investigates mechanochemical transformations in low- and high-pressure polyethylene using infrared spectroscopy. Polyethylene films were subjected to stretching, repeated deformation and relaxation, rupture under static and dynamic loads, and surface planing, including experiments in liqu…
The paper examines the interaction of aluminum chloride and beryllium chloride, a system of theoretically related chlorides with similar bonding and crystal-lattice characteristics. Using thermographic and X-ray phase analysis, electrical conductivity measurements, vapor-pressure studies, chemical a…
This paper reports the synthesis and characterization of glycidyl esters of phosphorus acids, a class for which little physicochemical information was available beyond patents. Glycidol was reacted with mono- and dichloroanhydrides of trivalent phosphorus acid esters in the presence of triethylamine…
This paper examines criteria for distinguishing adsorption isotherms for organic substances on mercury when concentration dependent data can fit several equations over limited ranges. It compares the Langmuir, Frumkin, and Parsons type formulations by deriving diagnostic relations involving the surf…
This paper reports the synthesis and characterization of mixed bimetallic organometallic derivatives of rhenium carbonyl prepared by reacting sodium rheniumpentacarbonyl with organotin, organolead, organobismuth, and cyclopentadienylirondicarbonyl chlorides. The resulting crystalline compounds were …
Radiation thermal transformations of liquid normal alkanes were investigated using n-tetratriacontane irradiated in a reactor at 150 to 380 degrees Celsius, with gas chromatographic and spectroscopic analysis of gaseous, liquid, and polymeric products. The study measures radiation chemical yields of…
This study examines the conditions under which silicon forms during the carbothermic reduction of silica, addressing contradictory interpretations based largely on indirect evidence. Mixtures of chemically pure silica and graphite at several silica to carbon ratios were heated in graphite crucibles …
This paper examines low-temperature relaxation processes in rubber-like polymers and relates mechanical and dielectric loss maxima to molecular mobility, polymer polarity, cross-linking, and supramolecular ordering. Natural and synthetic rubbers and their sulfur, thermal, and radiation vulcanizates …
This study examines the composition and chemical nature of sapropelic acids isolated from the Olera sapropel deposit after removal of higher plant fragments. The authors fractionated sapropelic and fulvic acids using acid extraction, solvents, alkali, ion exchange, hydrolysis, chromatography, oxidat…
This paper reports a new reaction of the isoxazole nucleus discovered during chlorination with hydrochloric acid and hydrogen peroxide in acetic acid. Whereas equimolar reagent amounts give ordinary 4-chloroisoxazoles, excess reagent leads to addition of the elements of hypochlorous acid to substitu…
This paper examines whether replacing aryl groups with alkyl groups changes the decomposition behavior of bis(cyclopentadienyl)titanium derivatives. Thermal decomposition of bis(cyclopentadienyl)diphenyltitanium and bis(cyclopentadienyl)dimethyltitanium was studied in n-hexane and tetrahydrofuran, u…
This paper examines the conversion of trimethyl ethers of 1,6-anhydro-D-aldohexoses into phenolic products under the action of metallic sodium in liquid ammonia, a reaction previously observed for several stereoisomeric sugars. The authors compare the behavior of levoglucosan ethers, quantify methan…
The study determines the solubility of lithium sulfate in water between 248 and 388°C at pressures up to about 1000 kg/cm², extending prior measurements near saturated vapor pressures to higher pressure conditions. Using a mercury autoclave method based on pressure decrease during dissolution of cry…
This paper reports the synthesis and characterization of N-carbamylhomoserine derivatives considered as structural analogs of N-carbamylaspartic acid, an early metabolite in pyrimidine base biosynthesis. The sodium salt of carbamylhomoserine was obtained in high yield by reacting homoserine with sod…
