Abstract For the first time were obtained ethyl 2-(2-methoxy-3, 4, 5, 6-tetrafluorobenzoyl)-3- oxobutanoate and ethyl 2-pentafluorobenzoyl-3-oxobutanoate and their copper chelates. The compounds were prepared by acylation of ethyl acetoacetate with 2-methoxy-3, 4, 5, 6- tetrafluoro-and pentafluorobenzoyl chlorides. Cyclization of these β, β'-dioxoesters afforded substituted chromones. 2-Methyl-5-methoxy-6, 7, 8-trifluoro-3-ethoxycarbonylchromone ...
