I\'ovel reactions of fluorosulfonic acid with fluorocarbon iodides have been discovered by which fluorocarbon fluorosulfates are prepared. The syntheses of CF~ CFZCF~ OSO~ F, CF2ClCFClOS02F and CF~ CFZCF (CF?)(CKZCF&OSOZF and their one-step conversions to CF3CF2CONH2, CF2ClCONHZ and CF3CF2CF (CF3) CH? CF2CH2COKH2 by ammonolysis of the respective fluorosulfates are described.