Photoinduced FeCl 3 -Catalyzed Chlorination of Aromatic Sulfonyl Chloride via Extrusion of SO 2 at Room Temperature

We report, herein, a photoinduced iron-catalyzed direct chlorination of aromatic sulfonyl chloride at room temperature. In this protocol, FeCl -catalyzed direct chlorination has been realized at room temperature under the irradiation of light (400-410 nm). During the process, many commercially or readily available substituted aromatic sulfonyl chlorides could produce the corresponding aromatic chlorides in moderate to good yields.