S 98 Synthesis of 2(3)-ethoxycarbonyl-5,6,7,8-tetrafluorochromones [Electronic resource] / V. I. Saloutin, Z. E. Skryabina, I. T. Bazyl, O. N. Chupakhin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1993. - Vol. 42, № 2. - P322-325 Рубрики: ХИМИЧЕСКИЕ НАУКИ Аннотация: The hitherto unknown ethyl pentafluorobenzoylpiruvate was prepared by condensing pentafluoroacetophenone with diethyl oxalate. Intramolecular cyclization of this ester or of its copper(II) chelate, as well as of ethyl 2-(ethoxymethylene)pentafluorobenzoylacetate affords 2- and 3-ethoxycarbonyl-5,6,7,8-tetrafluorochromones. Hydrolysis of the latter followed by decarboxylation gives 5,6,7,8-tetrafluorochromone \\\\Expert2\\nbo\\Russian Chemical Bulletin\\1993, 42 (2), 322-325.pdf |