Вид документа : Статья из журнала Шифр издания : 54/A 67 Автор(ы) : Charushin V. N., Chernyshev A. I., Sorokin N. N., Chupakhin O. N. Заглавие : Application of 1H and 13C NMR to the structural elucidation of tetrahydroquinoxalines condensed with five-membered heterocycles Место публикации : Organic Magnetic Resonance. - 1984. - Vol. 22, № 12. - С. 775-778 Примечания : Bibliogr. : p. 778 (22 ref.) ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): n-methyltetrahydroquinoxalines--pyrrole--imidazole Аннотация: 1H and 13C NMR spectral data for 21 N-methyltetrahydroquinoxalines annelated with furan, pyrrole, imidazole or thiazole rings are reported. Unambiguous assignments of the ring junction 13C resonances were made on the basis of selective decoupling experiments and with the aid of one-bond and long-range 13C–1H coupling constants. The effects of five-membered heterocycles on the 1H and 13C chemical shifts of the ring junction hydrogen and carbon atoms are considered. Values of one-bond 1J(CH) and vicinal 3J(HH) coupling constants between the ring junction protons are also discussed as a diagnostic means for structural elucidation of tetrahydroquinoxalines condensed with five-membered heterocycles. Доп.точки доступа: Charushin, V. N.; Chernyshev, A. I.; Sorokin, N. N.; Chupakhin, O. N.