ABSTRACT A sustainable and metal‐free method for the visible‐light‐promoted coupling of boronic acids with aryl sulfenyl chlorides has been developed to access structurally diverse unsymmetrical diaryl sulfides. The transformation proceeds smoothly under mild, aerobic conditions at room temperature using a catalytic amount of rose bengal as an organic photocatalyst and visible light as a green, renewable energy source. This protocol is operationally simple and enables the efficient construction of C─S bonds, delivering a diverse array of diaryl sulfides in reasonably good yields while exhibiting broad functional group tolerance. The strategy avoids the use of transition metals, harsh oxidants, and elevated temperatures, making it an environmentally benign and scalable process. This methodology provides a valuable synthetic platform for the construction of pharmaceutically and materially relevant sulfur‐containing scaffolds under eco‐friendly conditions.
Patel et al. (Fri,) studied this question.