Stereoselective vicinal difunctionalization of alkynes through trifluoromethylation and sulfonylation via a three-component reaction of alkynes, sodium sulfinates, and Togni reagent under catalyst- and additive-free conditions has been realized. This reaction proceeds at room temperature in dimethyl sulfoxide (DMSO), providing (E)-beta-trifluoromethylvinyl sulfones in moderate to good yields. The advantages of this tandem radical process include extremely mild conditions, excellent stereoselectivity, and easy experimental operation.