Fig. 1: Origin of the reaction design.
From: A practical fluorosulfonylating platform via photocatalytic imidazolium-based SO2F radical reagent

a The activation of SO2F2 for electrophilic and radical fluorosulfonylation. b The design and synthesis of benzimidazolium triflate derived IMSF reagent. c This chemistry: Cationic IMSF reagent for radical fluorosulfonylation of alkenes.