Вид документа : Статья из журнала Шифр издания : 54/R 30 Автор(ы) : Korotaev V.Yu., Sosnovskikh V. Ya., Kutyashev I. B., Kodess M. I. Заглавие : Reactions of 3-nitro-2-trihalomethyl-2H-chromenes with C-nucleophiles. Synthesis of 3-nitro-4-(pyrazol-4-yl)-2-trihalomethylchromanes [Electronic resource] Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2006. - Vol. 55, № 11. - С. 2020-2031 Систем. требования: http://www.springerlink.com/content/r2263vp3743515w5/fulltext.pdf Примечания : 26.10.2011 г. ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: The nucleophilic addition of acetylacetone and ethyl acetoacetate at the double bond of 3-nitro-2-trihalomethyl-2H-chromenes in the presence of NaH affords 2,3,4-trisubstituted chromanes containing the ?-dicarbonyl fragment at position 4. The trans-trans configuration and the enol structure of the reaction products were confirmed by 1H NMR spectroscopy and X-ray diffraction. Treatment of these compounds with hydrazine gives the corresponding 3-nitro-4-(pyrazol-4-yl)-2-trihalomethylchromanes. The reactions of 3-nitro-2-trihalomethyl-2H-chromenes with nitromethane and nitroethane in the presence of K2CO3 produce 1,3-dinitro derivatives of the chromane series Держатели документа: Центральная научная библиотека УрО РАН Доп.точки доступа: Korotaev, V.Yu.; Sosnovskikh, V. Ya.; Kutyashev, I. B.; Kodess, M. I.; Кодесс Михаил Исаакович