Terminal and cyclic alkenes reacted with iodotoluene difluoride and Et 3 N-5HF to give vic-difluoro products selectively.The direct addition of molecular fluorine to a carbon-carbon double bond is the most effective method for the preparation of vic-difluoro compounds 1 which have been used for the synthesis of fluorinated analogues of natural products. 2 However, the violent reactivity and the low accessibility of fluorine gas have restricted its application to organic synthesis. 3
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