Dimsyl Anion Enables Visible-Light-Promoted Charge Transfer in Cross-Coupling Reactions of Aryl Halides

A simple and mild methodology is reported for visible-light-promoted synthesis of unsymmetrical chalconides ena- bled by dimsyl anion in the absence of transition-metals or photoredox catalysts. The cross-coupling reaction between aryl halides and diaryl dichalconides proceeds in good to excellent yields with electron-rich, electron-poor, and heteroaromatic moieties. Mechanistic investigations using UV−Vis spectroscopy, time-dependent density functional theory (DFT) calculations, and control reactions suggest that dimsyl anion forms an electron-donor-acceptor (EDA) complex capable of absorbing blue light, leading to a charge transfer responsible for generation of aryl radicals from aryl halides. This previously unreported mechanistic pathway may be applied to other light-induced transformations performed in DMSO in the presence of bases and aryl halides.