TETRABUTYLAMMONIUM DIHYDROGENTRIFLUORIDE - AN EFFECTIVE SOURCE OF FLUORIDE-ION FOR HALOFLUORINATION OF ALKENES

Vicinal halofluorides have been prepared from the corresponding alkenes by reaction with a stoicheiometric amount of Bu4N+H2F3- as a source of fluoride anion and an excess of an N-halosuccinimide (NXS). The reaction products are obtained in good yields, with a prevalent Markownikoff regiochemistry. Olefins containing hydroxy, epoxy, acetoxy and alkoxy groups do not undergo side reactions under these reaction conditions.