Development of PhSCF2CF2SiMe3 as a Tandem Anion and Radical Tetrafluoroethylene Equivalent: Preparation of Tetrafluoroethyl-Substituted Alcohols and Tetrafluorotetrahydropyrans

PhSCF2CF2SiMe3 (1) was developed as a tandem anion and radical tetrafluoroethylene equivalent for the introduction of a CF2CF2 moiety. Fluoride-initiated nucleophilic additions of 1 to carbonyl compounds provide the corresponding alcohol adducts 2. Reduction of 2 gives tetafluoroethyl-containing alcohols 3, whereas 6-exo radical cyclizations of allyl ethers 4 yield tetrafluorotetrahydropyrans 5.