Switchable aroylation and diaroylation of allyl sulfones with aldehydes enabled by decatungstate photocatalysis

A tetrabutylammonium decatungstate (TBADT) mediated photocatalytic controllable aroylation or diaroylation of allyl sulfones was established to synthesize β,γ-unsaturated ketones and 1,5-diketones in moderate to excellent yields, respectively.