A series of 10 heterocycles was obtained from the reaction of 1, 1, 1-trifluoro-4, 4-diethoxy-3- buten-2-one and 1, 1, 1, 2, 2-pentafluoro-4, 4-diethoxy-3-penten-2-one with different dinucleofiles (hydrazine, methyl hydrazine, hydroxylamine and sodium cyanide). The ...