Вид документа : Статья из журнала Шифр издания : 54/C 98 Автор(ы) : Sosonkin I. M., Kalb G. L. , Kazantseva I. V., Ponizovskii M. G., Charushin V. N., Chupakhin O. N. Заглавие : Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 23. Electrochemical criteria for electrophilicity in 1,4-diazinium cations and their participation in cyclizations with acetoacetamide [Электронный ресурс] Место публикации : Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 8. - С. 888-895 Систем. требования: http://link.springer.com/article/10.1007/BF00473468 Примечания : Bibliogr. : p. 894-895 (22 ref.). - 22.10.15 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): pyrazinium--quinoxalinium--benzoquinoxalinium Аннотация: The polarographic reduction potentials E1/2 of the pyrazinium, quinoxalinium, benzoquinoxalinium, pyrido[2,3-b]pyrazinium, and pteridinium cations were determined. Annellation of a benzene ring increases the electrophilicity of the diazinium cations to a greater degree than the introduction of such electron acceptors as aza, aminocarbonyl, or methoxycarbonyl groups. The boundary between the active and inactive 1,4-diazinium salts was determined; cations with E1/2 values more negative than −0.50 V do not form either stable covalent adducts or cyclic diadducts through annellation of the dinucleophiles to the pyrazine ring. Доп.точки доступа: Sosonkin, I. M.; Kalb, G. L. ; Kazantseva, I. V.; Ponizovskii, M. G.; Charushin, V. N.; Chupakhin, O. N.