1.The reactions of tetrafluoro-1,2-ethanesultone and of hexafluoro-2,1-propanesultone with ethylene oxide follow the general type of the reactions of fluorine-containingβ-sultones with nucleophilic reagents.2.Difluorosulfoacetic acid bis-2-fluoroethyl ester, 2-fluoroethyl difluoro(fluorosulfonyl)acetate, and 2-fluoroethyl tetrafluoro-2-(fluorosulfonyl)propionate were prepared.3.By the reactions of polyfluoro-2-(fluorosulfonyl)alkanoyl fluorides with 2-fluoroethanol and with 2-chloroethanol the corresponding 2-haloethyl polyfluoro-2-(fluorosulfonyl)alkanoates were prepared