Вид документа : Статья из журнала Шифр издания : 54/R 30 Автор(ы) : Charushin V. N., Beb Van Veldhuizen, Henk C. van der Plas, Casper H. Stam Заглавие : Reactivity of 3-alkynylthio-1-ethyl-1,2-4-triazinium salts in intramolecular Diels-Alder reactions [Электронный ресурс] Место публикации : Tetrahedron. - 1989. - Vol. 45. - С. 6499-6510 Систем. требования: http://www.sciencedirect.com/science/article/pii/S0040402001895260 Примечания : Bibliogr. : p. 6510 (20 ref.). - 21.01.2016 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): 1,2,4-triazines--triethyloxonium tetrafluoroborate --diels-alder reactions Аннотация: Quaternization of 3-(3-butynylthio) and 3-(4-pentynyltio) substituted 1,2,4-triazines with triethyloxonium tetrafluoroborate in CH2Cl2 at room temperature occurs exclusively at N-1 yielding 3-alkynylthio-1-ethyl-1,2,4-triazinium salts, as unequivocally shown by the 13C NMR and X-ray crystallographic data. 3-Alkynylthio-1-ethyl-5-phenyl-1,2,4-triazinium salts undergo the intramolecular Diels-Alder reaction into the corresponding thieno [2,3-b]- and thiopyrano [2,3-b]pyridines under considerably milder conditions than the corresponding neutral 1,2,4-triazines. Доп.точки доступа: Charushin, V. N.; Beb Van Veldhuizen; Henk C. van der Plas; Casper H. Stam