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排序方式: 共有190条查询结果,搜索用时 15 毫秒
181.
182.
T. F. Osipova G. I. Koldobskii V. A. Ostrovskii Yu. E. Myznikov 《Chemistry of Heterocyclic Compounds》1985,21(6):700-703
Oxidation of substituted triaylformazanes by potassium permanganate in a twophase organic solvent-water system in the presence of catalytic amounts of tetrabutylammonium bromide gives the corresponding tetrazolium salts, which are interphase transfer catalysts in oxidation, alkylation, and esterification. From distribution coefficient data it is concluded that 2,3,5-triphenyltetrazolium chloride has less catalytic activity than 2,5-diphenyl-3-(m-nitrophenyl)-tetrazolium bromide.Communication 19, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 841–845, June, 1985. 相似文献
183.
H. Oppermann G. Kunze E. Wolf G. A. Kokovin I. M. Sitschova G. E. Osipova 《无机化学与普通化学杂志》1980,461(1):165-172
Investigations on the System Te/O/I By DTA measurements and by total pressure measurements was derived, that only a small solubility exists for TeI4 in TeO2, a composition of the typ Te6O11X2 does not exist. The existenz of TeOI2 in gas phase was derived from the transport behaviour of TeO2 with I2 and TeI4 respectively. The enthalpy of formation ΔH (TeOI2, g, 298) = ?10 ± 3 kcal/mol was derived from transport behaviour and the entropy S° (TeOI2, g, 298) = 89.2 e.u. – obtained from molecular constants. 相似文献
184.
Results are presented from experimental studies of an ac (44-kHz) arc discharge excited in an atmospheric-pressure argon jet between two copper electrodes. The first (central) electrode is a water-cooled rod with an axial opening for argon injection, while the second electrode is a loop of a tube lying in a plane perpendicular to the axis of the central electrode. The argon radiation spectra are measured, and the characteristic intensity profiles of the spectral lines as functions of the distance from the end of the central electrode are determined. All the observed transitions in the 245-to 370-nm wavelength range are identified. 相似文献
185.
Osipova V. A. Gorbunova T. I. Barabanov M. A. Mekhaev A. V. Vichuzhanin D. I. Smirnov S. V. Pestov A. V. 《Russian Journal of Applied Chemistry》2022,95(1):53-58
Russian Journal of Applied Chemistry - A series of N,N-dimethylaminoalkylamides of perfluorobutanoic and perfluoropentanoic acids were prepared, and the activity of these amides in curing of ED-20... 相似文献
186.
Solomonov I Osipova M Feldman Y Baehtz C Kjaer K Robinson IK Webster GT McNaughton D Wood BR Weissbuch I Leiserowitz L 《Journal of the American Chemical Society》2007,129(9):2615-2627
The morphology of micrometer-sized beta-hematin crystals (synthetic malaria pigment) was determined by TEM images and diffraction, and by grazing incidence synchrotron X-ray diffraction at the air-water interface. The needle-like crystals are bounded by sharp {100} and {010} side faces, and capped by {011} and, to a lesser extent, by {001} end faces, in agreement with hemozoin (malaria pigment) crystals. The beta-hematin crystals grown in the presence of 10% chloroquine or quinine took appreciably longer to precipitate and tended to be symmetrically tapered toward both ends of the needle, due to stereoselective additive binding to {001} or {011} ledges. Evidence, but marginal, is presented that additives reduce crystal mosaic domain size along the needle axis, based on X-ray powder diffraction data. Coherent grazing exit X-ray diffraction suggests that the mosaic domains are smaller and less structurally stable than in pure crystals. IR-ATR and Raman spectra indicate molecular based differences due to a modification of surface and bulk propionic acid groups, following additive binding and a molecular rearrangement in the environment of the bulk sites poisoned by occluded quinoline. These results provided incentive to examine computationally whether hemozoin may be a target of antimalarial drugs diethylamino-alkoxyxanthones and artemisinin. A variation in activity of the former as a function of the alkoxy chain length is correlated with computed binding energy to {001} and {011} faces of beta-hematin. A model is proposed for artemisinin activity involving hemozoin nucleation inhibition via artemisinin-beta-hematin adducts bound to the principal crystal faces. Regarding nucleation of hemozoin inside the digestive vacuole of the malaria parasite, nucleation via the vacuole's membranous surface is proposed, based on a reported hemozoin alignment. As a test, a dibehenoyl-phosphatidylcholine monolayer transferred onto OTS-Si wafer nucleated far more beta-hematin crystals, albeit randomly oriented, than a reference OTS-Si. 相似文献
187.
V. P. Osipova N. A. Antonova N. T. Berberova A. I. Poddel’skii K. V. Kudryavtsev 《Russian Journal of Electrochemistry》2011,47(10):1119-1124
The method of cyclic voltammetry on a platinum electrode in acetonitrile is used to study the redox properties of a number
of novel pyrrolidine derivatives containing a sterically hindered phenol fragment. It is found that the obtained derivatives
of (3,5-di-tert-butyl-4-hydroxyphenyl)pyrrolidine-2-carboxylic acid are irreversibly oxidized in two stages with formation of a phenoxy radical.
The structural analogue containing no phenyl fragment is irreversibly oxidized under similar conditions in a single stage.
Formation of a stable phenoxy radical from synthesized (3,5-di-tert-butyl-4-hydroxyphenyl)pyrrolidines under PbO2 oxidation is confirmed by ESR spectroscopy. Application of the synthesized compounds as antioxidant agents has been suggested. 相似文献
188.
Yu. I. Blokhin K. N. Kornilov Yu. V. Osipova A. M. Bagautdinov M. V. Tabardak I. A. Lubimov 《Phosphorus, sulfur, and silicon and the related elements》2013,188(11):1478-1496
Abstract The data on the synthesis, structures, and chemical properties of macrocyclic compounds containing endo-cyclic atoms of tri- and pentavalent phosphorus are summarized. Methods for the synthesis of the described macrocycles are reported. Peculiarities of structure, chemical properties, particularly formation of complexes, catalytic activity, and practical applications are analyzed. The bibliography includes 155 references. 相似文献
189.
M. A. Orlova E. Yu. Osipova S. A. Rumyantsev S. P. Ashurko 《Russian Chemical Bulletin》2012,61(2):405-408
Porphyrinofullerene nanoparticles (NP) containing magnetic isotopes 25Mg and 67Zn (25Mg-NP and 67Zn-NP) and the natural isotopic composition of zinc (Zn) were tested on human leukemic cells of patients with acute leukemia and on lymphocytes of healthy donors. The fundamental differences in the cytotoxic effect of magnetic and nonmagnetic zinc isotopes on tumor cells were observed, as well as the complete absence of the influence of the magnetic magnesium isotope and pristine nanoparticles. The 67Zn-NP manifested high cytotoxicity towards cells of acute B-lymphoblast leukemia with LD50 almost three times lower than that of healthy donors and four times lower than that of the Zn-NP. Apoptosis was evaluated by cytofluorimetry for the drugs used. 相似文献
190.
Alexey N. Rodionov Alexander A. Simenel Alexander A. Korlyukov Svetlana M. Peregudova Elena Yu. Osipova 《Journal of organometallic chemistry》2011,696(10):2108-245
New ferrocene derivatives - ethyl esters of 1-aryl-5-ferrocenyl-1H-pyrazole-3-carboxylic acids were synthesized. The corresponding aldehydes were obtained from acid esters in two steps. The reductive amination reaction of 5-ferrocenyl-1-phenyl-1H-pyrazole-3-carbaldehyde was studied. Several of these compounds were investigated by cyclic voltammetry. All of them exhibited a reversible one-electron oxidation-reduction wave owing to the ferrocene-ferricinium redox couple with a positive shift (0.51-0.69 V) compared with that of ferrocene (0.46 V). The X-ray crystal structure of the ethyl ether 1-(3-chloro-2-fluorophenyl)-5-ferrocenyl-1H-pyrazole-3-carboxylic acid is also presented. 相似文献