The reaction of 2, 5-dibromo-l, 3, 4thiadiaeole with silver fluoride gave 2-bronio-5-fluoro-1, 3, 4-thiadiazole and isocyanogen tetrafluoride which was also prepared from the respective tetrabromide. 3-Perfluoroalkyl-5-fluoro-1, 2, 4thiadiazoles were obtained in a two-step synthesis by reaction of perhalogenated alkylamidines with trichloromethanesulfonyl chloride, and fluorination of the reaction products with silver fluoride, in one case with ...
