The use of elemental fluorine in organic synthesis has not yet achieved the stage of being a standard procedure, but on the other hand it is not the frightening proposition it used to be until recently. It can serve as a source for fluorine radicals,'electrophilic fluorine, 2 and nucleophilic fluorine generated in situ. 3 But elemental fluorine is more than that. Recently, we have shown that it can serve as a vehicle for performing difficult chemical ...