The reactions of nitrogentrifluoride (1) with hexafluoropropene (2) in the presence of cesium fluoride (CsF) gave 2- (3) and 1-heptafluoropropyldifluoroamine (4) in moderate yields. Tetrafluoroethylene (6) and octafluoro-2-butene (8) similarly reacted with 1 to give corresponding products.