Abstract The exchange of chlorine in β-chloroalkyl phenyl (or methyl) thioethers by fluorine, with anchimeric assistance of sulfur, is very easily realized with the almost neutral fluorinating reagent, Et 3 N. 3HF. The 'one-pot'reactions of alkenes with sulfenyl chlorides and subsequently with Et 3 N. 3HF lead to the corresponding β-fluoroalkyl thioethers in high yields.
