Fluorinated P-sultones

Generally, sulfur trioxide reacts with hydrocarbon olefins quite vigorously and has to be either diluted or used in complexes with pyridine or dioxane to moderate its reactivity. The corresponding cycloadducts, p-sultones, easily undergo ring opening and have not yet been isolated. In sharp contrast, fluorinated p-sultones are relatively stable materials and over 50 compounds of this type have been prepared and isolated. Synthesis and chemistry of this class of heterocycles is well documented and has been previously reviewed. ... 

The original reports on synthesis of fluorinated p-sultones appeared from three different groups at approximately the same time in late 1950s.Addition of freshly distilled sulfur trioxide to TFE, chlorotrifluoroethylene, hexafluoropropylene, and... 

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