Fluorinated sulfilimino iminiums: a versatile source of perfluoroalkyl radicals under photoredox catalysis
Résumé
Reported herein is the use of S-perfluoroalkyl
sulfilimino iminiums as anew source of RF radicals under
visible-light photoredox catalysis (RF=CF3,C4F9,CF2Br,
CFCl2). These shelf-stable perfluoroalkyl reagents,readily
prepared on gram scale from the corresponding sulfoxide
using aone-pot procedure,allowthe efficient photoredoxinduced
oxyperfluoroalkylation of various alkenes using facIr(ppy)3
as the photocatalyst. Importantly,spin-trapping/electron
paramagnetic resonance experiments were carried out to
characterize all the radical intermediates involved in this
radical/cationic process.