Multicomponent\nHeterogeneous Semiconductor Photocatalytic\nSulfinylsulfonylation of Alkenes with Alkyl Iodides and SO<sub>2</sub>

A multicomponent heterogeneous semiconductor\nphotocatalytic\nsulfinylsulfonylation\nof alkenes with alkyl iodides and SO<sub>2</sub> was displayed under\nmild metal-free conditions by using boron carbonitride (BCN) as the\nalternative photocatalyst. This approach has resulted in the production\nof a wide range of structurally diverse sultine products in moderate\nto high yields, using readily available starting materials including\nalkyl iodides and olefins with broad functional group tolerance. The\nmethod is also suitable for the late-stage functionalization of complex\nbioactive molecules. A radical-polar crossover cyclization (RPCC)\nprocess was proposed based on mechanistic studies.