Visible-light photocatalytic trifluoromethylation of arenes using graphene oxide as metal-free photocatalyst
Photocatalytic trifluoromethylation has been considered as an efficient method to introduce trifluoromethyl group into organic substances. However, the relatively high cost and toxic feature of these metal-based photocatalysts become major obstacles for their further applications in this area. In this work, graphene oxide sheets have been utilized as a kind of metal-free photocatalysts for the trifluoromethylation of arenes with CF3SO2Na under visible light irradiation and room temperature. It is shown that such carbocatalysts possess suitable bandgaps to photocatalysis oxide CF3SO2Na to form electrophilic radical •CF3, which efficiently induces the trifluoromethylation of benzene and some derivatives. In addition, the catalysis performance and mechanism of these graphene oxide sheets have also been discussed.