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11.
Lyashenko G. S. Medvedeva A. S. Yazovtsev I. A. Albanov A. I. Demina M. M. 《Russian Journal of Organic Chemistry》2002,38(2):147-149
The hydrosilylation of a number of acetylenes RCCH (R, R' = Ph, CH2OPh, CH2SPh) with -ethynylhydrosilanes Me2SiHCHCR' in the presence of H2PtCl6 was investigated. The addition did not occur regioselectively, but was stereospecific and afforded a mixture of - and trans--adducts. The replacement of phenyl substituent by phenoxymethyl both in the molecule of ethynylsilane and the acetylene substrate resulted in growing proportion of the -adduct in the reaction mixture up to 10-60%. 相似文献
12.
The literature on the modification of polylactide by high-energy chemistry methods including low-temperature plasma treatment, laser and electron-beam irradiation, bombardment with high-energy ions, and γ-irradiation has been surveyed. The main procedures for polylactide treatment by plasma, facilities used in these processes, and instrumental methods for the characterization of changes in the chemical structure and properties of the polymer have been described. Data on the application of polylactide modified by high energy chemistry methods and materials on its basis in medicine and biotechnology are presented. 相似文献
13.
I. V. Gravel A. A. Skibina A. N. Kuz’menko N. B. Demina I. I. KrasnyukJr. S. P. Zavadskiy A. V. Pirogov 《Moscow University Chemistry Bulletin》2017,72(4):192-195
The chemical composition of Asparagus racemosus roots is studied by the methods of gas chromatography and high-performance liquid chromatography. Marker substances characteristic of this type of raw materials are revealed. The dioscin content in the roots of A. racemosus is quantitatively determined. 相似文献
14.
L. I. Demina L. G. Kuz’mina S. V. Demin N. A. Shokurova V. I. Zhilov A. Yu. Tsivadze 《Russian Journal of Inorganic Chemistry》2017,62(11):1536-1543
The complex formation of lithium with benzo-15-crown-5 (B15C5) was investigated. The complexes LiB15C5H2OX, where X = Cl? (1), I? (2), (3), (5), and LiBF4B15C5 (4) were synthesized and studied by IR spectroscopy. Complexes 1–4 were examined by X-ray diffraction. According to IR spectroscopy data, the crown ether conformation changes upon dissolution. The interaction of the extracted complex with the solvent was identified. 相似文献
15.
O. A. Demina A. V. Demin N. P. Gnusin V. I. Zabolotskii 《Polymer Science Series A》2010,52(12):1270-1282
The effect of the aprotic solvent dimethylacetamide on the equilibrium and transport properties of heterogeneous (MK-40, MA-40,
and MA-41) and homogeneous (MF-4SK) ion-exchange membranes is investigated. On the basis of concentration dependences of the
conductivity and diffusion permeability of membranes, model calculations of transport-structural parameters that reflect the
structural and kinetic characteristics of conducting phases of the swollen polymer are performed. The effect of the aprotic
solvent on the flow of current through the structural fragments of the ion-exchange material is estimated. The causes of changes
that are induced in the properties of the membranes by the aprotic solvent are ascertained. 相似文献
16.
Nikolai A. Kudryashov Dmitry I. SinelshchikovMaria V. Demina 《Physics letters. A》2011,375(7):1074-1079
The generalized Bretherton equation is studied. The Bäcklund transformations between traveling wave solutions of the generalized Bretherton equation and solutions of polynomial ordinary differential equation are constructed. The classification problem for meromorphic solutions of the latter equation is discussed. Several new families of exact solutions for the generalized Brethenton equation are given. 相似文献
17.
A. V. Laptev A. Yu. Lukin N. E. Belikov R. V. Zemtsov V. I. Shvets O. V. Demina S. D. Varfolomeev V. A. Barachevskii A. A. Khodonov 《High Energy Chemistry》2010,44(3):211-215
A new photochromic probe containing a spacer with the reactive carboxyl terminal group at the C5 atom of the photochrome molecule
was synthesized. The spectral and kinetic study of the behavior of the new photochromic probes in toluene and ethanol was
performed. 相似文献
18.
19.
T. S. Demina T. A. Akopova L. V. Vladimirov A. N. Shchegolikhin A. S. Kechek’yan N. S. Perov A. O. Chernyshenko A. N. Zelenetskii 《Polymer Science Series B》2011,53(5-6):358-370
New polymer salts and N-acetylated chitosan derivatives are prepared in an extruder by the method of solid-phase synthesis via the interaction of chitosan and 2,2-bis(hydroxymethyl)propionic acid. The effect of the initial component ratio and temperature on the yield and structure of the target products is studied. Joint deformation of solid components at room temperature is found to cause the quantitative formation of salt bonds between carboxylic groups of the acid and amino groups of chitosan. At elevated temperatures of synthesis, the corresponding acetylated derivatives with a degree of substitution of amino groups varying from 0.16 to 0.43 are prepared. The relaxation and phase transitions in the polymer salts and acetylated chitosan derivatives and their sorptional activity are studied. The films prepared from aqueous solutions of the new salt modification of chitosan are characterized by a homogeneous structure and improved mechanical characteristics relative to those of the films based on chitosan acetates. An additional thermal treatment of the products of the solid-phase synthesis leads to the formation of crosslinked and water-swollen materials that can be used for the development of novel polymeric chitosan-based membranes and sorbents. 相似文献