Abstract The availability of no-carrier-added (nca) 1-bromo-4-[18 F] fluorobenzene with high radiochemical yields is important for 18 F-arylation reactions using metallo-organic 4-[18 F] fluorophenyl compounds (eg of lithium or magnesium) or Pd-catalyzed coupling. In this study, different methods for the preparation of 1-bromo-4-[18 F] fluorobenzene by nucleophilic aromatic substitution reactions using nca [18 F] fluoride were examined. Of ...