 Where te nitrogen is in a ring this can work, as long as it is not aromatic.Sulfamoyl fluorides can also be made from sulfamoyl chlorides, by reacting with a substance that can supply the fluoride ion, such as NaF, KF, HF, or SbF3.Sulfonamides can undergo a Hofmann rearrangement when treated with a Difluoro-λ3-bromane to yield a singly substituted N-sulfamoyl fluoride.