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排序方式: 共有64条查询结果,搜索用时 31 毫秒
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V.V. Nosyreva A.G. Mal'kina O.A. Shemyakina E.I. Kositsyna A.I. Albanov B.A. Trofimov 《Russian Journal of Organic Chemistry》2005,41(8):1202-1207
Nucleophilic addition of tetrazole to 4-hydroxy-4-alkyl-2-alkynonitriles and to 3-phenyl-2-propynonitrile occurred regiospecifically and afforded E-, Z-4-hydroxy-4-methyl-3-tetrazolyl-2-alkenonitriles and 3-tetrazolyl-3-phenyl-2-propenonitrile [20–40°C, 13–50 h, 4–15 wt% MOH (M = Na, K), THF (or DMSO)] in up to 69% yield. The attempt to perform cyclization of the hydroxy-containing adducts into iminodihydrofurans (KOH, ethanol, 23-25°C) resulted in vinyl nucleophilic substitution of the tetrazole moiety by an ethoxy group. 相似文献
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Andriyankova L. V. Zhivet'ev S. A. Mal'kina A. G. Kudryakova P. N. Kositsyna E. I. Il'icheva L. N. Ushakov I. A. Afonin A. V. Trofimov B. A. 《Russian Journal of Organic Chemistry》2002,38(11):1681-1685
Reactions of nucleophilic addition of 2- and 4-mercaptopyridines to 3-phenyl-2-propynonitrile, 4-hydroxy-4-alkyl-2-alkynonitriles, and methyl 2-butynoate (triethylamine, 20-25 or 100°C) give rise to the corresponding S-adducts with Z-configuration (for cyanoethylenes), or to a mixture of E- and Z-isomers in 60:40 ratio for methyl 2-butynoate. 相似文献
4.
B. A. Trofimov G. F. Myachina S. A. Korzhova A. G. Mal'kina L. V. Sokolyanskaya T. I. Vakul'skaya Yu. V. Mikhailik T. A. Skotheim 《Russian Journal of Electrochemistry》2002,38(2):188-192
The electrochemical activity of new highly sulfurized polyconjugated polymers is studied. The polymers, polythienothiophene, poly(4,5,6,7-tetrathieno-4,5,6,7-tetrahydro-2,3-dehydrobenzothiophene), poly(6-methylthieno[2,3-b]pyridine-4-thione-5-thiol), and poly(6H-thieno[2,3-b]-azepine-6,7(8H)-dithione) are obtained in a deep sulfurization of polyethylene, polystyrene, and poly(5-vinyl-2-methylpyridine) by elemental sulfur. Employed as active cathodic material in lithium batteries, these polymers ensure their prolonged cycling with specific discharge capacity of up to 339 mA h/g. The effect of the conducting additive and electrolyte on the energy capacity and cycling of polymer cathodes in lithium batteries is discussed. 相似文献
5.
N. D. Abramova L. V. Andriyankova A. G. Mal'kina Yu. M. Skvortsov 《Russian Chemical Bulletin》1992,41(6):1128-1129
The reaction of 1-phenyl-2-cyanoacetylene and 4-hydroxy-4-methyl-2-pentynenitrile with benzimidazol-2-one was studied. The respective N,N-diadducts were obtained. It was shown that the addition of benzimidazol-2-one to the tertiary cyanoacetylenic alcohol catalyzed by bases is accompanied by intramolecular cyclization.Irkutsk Institute of Organic Chemistry, Siberian Branch, Russian Academy of Sciences, 664033 Irkutsk. Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 6, pp. 1140–1443, June, 1992. 相似文献
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N. D. Abramova L. V. Andriyankova Yu. M. Skvortsov A. G. Mal'kina é. I. Kositsyna A. I. Albanov G. G. Skvortsova 《Chemistry of Heterocyclic Compounds》1986,22(10):1145-1148
Substituted 1,3-thiazinoazoles were obtained by treating benzimidazole-2-thione, 4,5-diphenylimidazole-2-thione, and 1,2,4-triazole-3-thione with tertiary cyanoacetylenic alcohols and their acetals in the presence of lithium hydroxide. Treatment of the 1,3-thiazinobenzimidazoles with base destroyed the thiazino ring forming benzimidazol-2-one.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1412–1415, October, 1986. 相似文献
8.
B. A. Trofimov V. V. Nosyreva A. G. Mal'kina 《Russian Journal of Organic Chemistry》2005,41(9):1254-1259
Macrocyclic polyether dibenzo-18-crown-6 possessing a specific affinity for potassium cation inhibits ethynylation of acetone with acetylene in the presence of KOH according to Favorskii. The inhibition becomes stronger in the presence of the complex dibenzo-18-crown-6 ? KOH ? MeOH as catalyst (both in excess acetone and in DMSO). The effect does not originate from deactivation of acetone, for its aldol-like condensation is accelerated in the presence of both dibenzo-18-crown-6 and its complex (the selectivity of ethynylation sharply falls down). Thus, apart from the high basicity of the medium, activation of acetylene due to complex formation with potassium cation plays an important role in the Favorskii ethynylation of ketones. 相似文献
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G. G. Skvortsova N. D. Abramova A. G. Mal'kina Yu. M. Skvortsov B. V. Trzhtsinskaya A. I. Albanov 《Chemistry of Heterocyclic Compounds》1982,18(7):736-739
The reaction of phenylcyanoacetylene with imidazolethiones was studied. It is shown that in the presence of 5–10% KOH the addition of phenylcyanoacetylene is accompanied by intramolecular cyclization with the formation of imidazo-1,3-thiazines. An increase in the amount of catalyst to 20% leads to cleavage of the thiazine ring at the C-S bond and the formation of the corresponding acrylonitrile derivatives. Products of addition of 2 moles of phenylcyanoacetylene were obtained.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 963–966, July, 1982. 相似文献