IF 5 affects the final stage of the Cl–F exchange fluorination in the synthesis of pentafluoro-λ 6 -sulfanyl-pyridines, pyrimidines and benzenes with electron-withdrawing substituents

-sulfanyl-(hetero)arenes having electron-withdrawing substituents has now been elucidated through the use of iodine pentafluoride. A major side-reaction of C-S bond cleavage was sufficiently inhibited by the potential interaction between F and I with a halogen bonding.