Вид документа : Статья из журнала Шифр издания : 54/C 98 Автор(ы) : Yufit D. S., Struchkov Yu. T., Drozd V. N., Charushin V. N., Baklykov V. G., Chupakhin O. N. Заглавие : Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 22. Crystal and molecular structure of tetrahydroquinoxaline condensed with the six-membered 1,3,4-thiadiazine ring [Электронный ресурс] Место публикации : Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 5. - С. 583-587 Систем. требования: http://link.springer.com/article/10.1007/BF00476392 Примечания : Bibliogr. : p. 587 (19 ref.). - 22.10.15 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): x-ray diffraction --hydrogens--tetrahydropyrazine Аннотация: X-ray diffraction examination of 4-acetyl-10-methyl-2-phenyl-1,4,4a,5,10,10a-hexahydro-1,3,4-thiadiazino[5,6-b]quinoxaline has shown that the 4a-H and 10a-H hydrogens attached to the carbon atoms common to both heterocycles are cis-oriented, as in the annelation of five-membered heterocycles to the tetrahydropyrazine ring, but in this case the torsion angle H(4a)C(4a)C(10a)H(10a) is much greater, having a value of 60‡ Доп.точки доступа: Yufit, D. S.; Struchkov, Yu. T.; Drozd, V. N.; Charushin, V. N.; Baklykov, V. G.; Chupakhin, O. N.