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1.
Yu. M. Kargin E. I. Gritsenko V. V. Yanilkin V. V. Plemenkov L. K. Dubovik N. I. Maksimyuk B. M. Garifullin Sh. K. Letypov A. V. Il'yasov 《Russian Chemical Bulletin》1992,41(9):1572-1579
The electrochemical reduction of 1,1-dihalo-2-R-2-methylcyclopropanes was studied by polarography and preparative electrolysis. A mixture of stereoisomeric monoboro- and monochlorocyclopropanes was obtained with preparative yield of 60–70% in preparative electroreduction in methanol against a background of 0.1 M LiClO4. In the case of bromine derivatives of cyclopropanes (except when R = CN) an effect was found on the part of the current density on the ratio of cis and trans isomers, which was interpreted as a change, in dependence on current density, of the contributions of the reactions of reduction of the starting compounds (SN2 mechanism) and ionic pairs (SN1 mechanism). The effect of the solvent (CHCl3, DMF, DMSO, MeOH) and background salt (LiClO4, Et4NBr) on the ratio of stereoisomers is in agreement with this interpretation.A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Science Center, Russian Academy of Sciences, Kazan. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 9, pp. 2023–2032, September, 1992. 相似文献
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Strunskaya E. I. Yanilkin V. V. Bredikhina Z. A. Nastapova N. V. Morozov V. I. Maksimyuk N. I. Sharafutdinova D. R. Bredikhin A. A. 《Russian Journal of General Chemistry》2003,73(5):806-815
The electron-acceptor nitrogen and sulfur atoms in 3,4-disubstituted 1,2,5-thiadiazoles are responsible for much decreased reduction potentials and much increased oxidation potentials of these compounds compared with the corresponding carbocyclic derivatives. The thiadiazole ring is resistant to oxidation, and the reversible electron transfer gives rise to fairly stable radical cations. Reductive stability of the heterocycle depends on the nature of its substituents and on the medium: When nucleofuge substituents are present, two-electron transfer in aprotic media results in heteroring opening with iminonitrile formation, whereas in the presence of two readily leaving groups, the electron transfer induces cleavage of the complete heteroring into inorganic anions. 相似文献
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P. A. Maksimyuk S. E. Litvin V. Navrátil M. Hamerský 《Czechoslovak Journal of Physics》1979,29(8):924-927
Internal friction measurements were used for the examination of Cd + Zn alloy single crystals. It was established that the interaction energy between solute Zn atoms and dislocations in basal planes is 0·12 eV.The authors thank Dr. P.Luká, CSc., for valuable discussions. 相似文献
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A. Z. Zhmudskii V. I. Koshel' P. A. Maksimyuk N. P. Fedas 《Russian Physics Journal》1970,13(3):350-352
A study has been made of the effect of nickel, iron, and manganese on the solubility of copper in solid silicon-aluminum alloys. Nickel leads to solid solutions having the least copper. Iron has essentially no effect on the solubility of copper in the solid solution. Manganese, which binds copper in the ternary compound Al12Mn2Cu, partially replaces it in solid solution.Translated from Izvestiya VUZ. Fizika, No. 3, pp. 92–95, March, 1970. 相似文献
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V. V. Yanilkin N. I. Maksimyuk E. I. Strunskaya B. M. Garifullin Yu. M. Kargin 《Russian Chemical Bulletin》1993,42(8):1340-1343
The effect of the nature of organic electron transfer agents and of PtII, PdII, RhII, CoII, NiII, CuII, CrIII, MnII, TiIII, VIII, ZnII, and AgI metal ions on the kinetics of the homogeneous reduction ofgem-dichlorocyclopropanes has been studied. PtII, PdII, RhIII, CoII, and NiII ions accelerate this process, VIII and AgI ions exert practically no effect on the reduction rate, and the rest of the metal ions exhibit inhibitor properties.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1407–1410, August, 1993. 相似文献
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I. E. Petrushenko V. A. Maksimyuk I. C. Chernyshenko 《International Applied Mechanics》1988,24(10):972-976
Institute of Mechanics, Academy of Sciences of the Ukrainian SSR, Kiev. Translated from Prikladnaya Mekhanika, Vol. 24, No. 10, pp. 41–46, October, 1988. 相似文献