S 73 Sosnovskikh, V. Ya. Reaction of 3,3-dialkyl-6-trifluoromethyl-2,3-dihydro-4-pyrones with hydrazine hydrate [Electronic resource] / V. Ya. Sosnovskikh, M. Yu. Mel'nikov, M. I. Kodess // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1998. - Vol. 47, № 7. - P1365-1368 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: 3,3-Dialkyl-2,3-dihydro-6-trifluoromethyl-4-pyrones react with hydrazine hydrate to give 2-hydrazino-2-trifluoromethyl-4-tetrahydropyrone hydrazones. When heated, the latter are transformed into 3(5)-(2-hydroxyethyl)-5(3)-trifluoromethylpyrazoles, while their treatment with HCl in ether leads to 3,3-dialkyl-2,3-dihydro-6-trifluoromethyl-4-pyrone azines \\\\Expert2\\nbo\\Russian Chemical Bulletin\\1998, 47 (7), 1365.pdf |