Вид документа : Статья из журнала Шифр издания : 54/A 18 Автор(ы) : Khabibulina I.V., Trifonov R.E., Volovodenko A.P. , Eremenkova M.S., Chupakhin O. N., Rusinov V. L., Zyryanov G. V., Ostrovskii V.A. Заглавие : Acid-base properties and prototropic tautomerism of isomeric 1,2,4-triazin-3- and -5-ones [Electronic resource] Место публикации : Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2004. - Vol. 40, № 3. - С. 426-430 Систем. требования: http://www.springerlink.com/content/h65210271hk6w421/fulltext.pdf Примечания : Bibliogr. : p. 430 (40 ref.). - 1.11.2011 г. ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: The acidity and basicity constants of isomeric phenyl(aryl)-1,2,4-triazin- 3- and -5-ones in aqueous solution were determined by spectrophotometry: pK a = 7.3-6.2; pKBH+ = 0.1 to -2.2. 1,2,4-Triazin-3-ones are weaker bases than the corresponding 1,2,4-triazin-5-ones. According to the AM1 calculations, the most thermodynamically favorable tautomer in the gas phase is the oxo form: namely, 2H-tautomers of the neutral bases and 2,4-H,H +-tautomers of the conjugate acids. Держатели документа: Центральная научная библиотека УрО РАН Доп.точки доступа: Khabibulina, I.V.; Trifonov, R.E.; Volovodenko, A.P. ; Eremenkova, M.S.; Chupakhin, O. N.; Rusinov, V. L.; Zyryanov, G. V.; Ostrovskii, V.A.