Вид документа : Статья из журнала Шифр издания : 54/H 10 Автор(ы) : Rykowski A., Chupakhin O. N., Kozhevnikov D. N., Kozhevnikov V. N., Rusinov V. L., Van der Plas H. C. Заглавие : H-1 and C-13-NMR investigations on-adduct formation of 1,2,4-triazine 4-oxides and 3-chloro-6-phenyl-1,2,4-triazine with liquid ammonia and alkylamines Место публикации : Heterocycles. - 2001. - Т. 55, № 1. - С. 127-133 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: 1H- and 13C-NMR spectra of the ?-adducts formed between 6-phenyl-1,2,4-triazine 4-oxide (1a), 3-ethyl-6-phenyl-1,2,4-triazine 4-oxide (1b) and liquid ammonia, methylamine or dimethylamine are described, together with 1H NMR spectra of 3-chloro-6-phenyl-1,2,4-triazine (7) in liquid ammonia. The results of the NMR study have shown that the carbon C-5 in 1a-b and 7 is the preferred site for nucleophilic attack by liquid ammonia and alkylamines at low temperatures (from -75° to -20°C). The ?-adduct (5e) formed between 1a and dimethylamine at -75°C on heating to -20°C irreversibly converts to open-chain product (3a), via intermediary C-3 ?-adduct (6). The amination of 7 into 3-amino-6-phenyl-1,2,4-triazine (10) occurs via SN(AE) mechanism involving the isomerisation of the C-5 ?-adduct (8) into the C-3 ?-adduct (9) as confirmed by a 15N study with labeled liquid ammonia. Держатели документа: Центральная научная библиотека УрО РАН Доп.точки доступа: Rykowski, A.; Chupakhin, O. N.; Kozhevnikov, D. N.; Kozhevnikov, V. N.; Rusinov, V. L.; Van, der Plas H. C.