Visible light-promoted defluorinative alkylation/arylation of α-trifluoromethyl alkenes with thianthrenium salts

Defluorinative alkylation and arylation between thianthrenium salts and α-trifluoromethyl alkene to afford gem -difluoroolefins by easily recycling thianthrene under visible light irradiation and free of metal photocatalyst.