The synthesis and stability of some perfluoroalkl- and perfluoroalkylene-1,2,4- and 1,3,4-oxadiazoles

5-Perfluoroalkyl-3-phenyl-1,2,4-oxadiazoles have been synthesised directly from benzamidoxime and perfluoromonoacyl chlorides. However, a more complex pattern of products was observed in the reaction between arylamidoximes and perfluorodiacyl chlorides. Depending on the conditions, the products were O, O′-perfluorodiacyl di(arylamidoximes), α, ω-bis(3-aryl-1,2,4-oxadiazol-5-yl) perfluoroalkanes and arylamidoxime (3-aryl-1,2,4-oxadiazol-5-yl)perfluorocarboxylates.