A new synthetic method for alkyl sulfones through CC bond formation between alkenes and tosylmethylphosphonium iodide is reported. A tosylmethyl radical is generated from the phosphonium iodide under irradiation of visible light with the aid of fac-Ir(ppy)3. It undergoes regioselective 1,2-addition across the carboncarbon double bond to afford an elongated alkyl radical, which abstracts a hydrogen atom from C6F5SH, producing an alkyl sulfone with one-carbon extension.
- Phosphonium salts
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