K2S2O8-Mediated Aerobic Oxysulfonylation of Olefins into β-Keto Sulfones in Aqueous Media

beta-Keto sulfones were obtained in good to excellent yields (73-94%) directly from unactivated olefins by employing inexpensive sodium arenesulfinate salts as sulfonylating agents and K2S2O8 as a radical initiator in open flasks and aqueous media at room temperature under transition-metal-free conditions. The reported oxidative sulfonylation protocol is highly practical and environmentally benign, as self-manifested by the extremely mild reaction conditions.