Metal‐Free Desulfonylation Reaction Through Visible‐Light Photoredox Catalysis

Abstract The desulfonylation of β‐arylketosulfones has been achieved in good to excellent yields by using 3‐W blue LEDs light, 1 mol‐% organic dye eosin Y bis(tetrabutylammonium salt) as photocatalyst, and diisopropylethylamine as reducing agent. Mechanistic studies demonstrate that oxidative quenching of the excited eosin Y by β‐arylketosulfones plays a crucial role in the present photoredox catalytic cycle.