14C‐labeling of isomeric perfluoroalkyl carboxanilide mixtures via electrofluorination

Electrofluorination of benzoyl chloride-ring-UL-14C produced an isomer mixture of cyclic C6F11 carbonyl fluorides, principally 1,2,2,3,3,4,4,5,5,6,6-undecafluorocyclohexane-ring-UL14C carbonyl fluoride, which was derivatized with 2-bromo-4-nitroaniline and triethyl amine. The resultant carboxanilide mixture is designated as EL-499 labeled with 14C in the perfluoro alkyl ring for use in metabolic studies.