Exploring the Reducing Ability of Organic Dye (Acr + -Mes) for Fluorination and Oxidation of Benzylic C(sp 3 )-H Bonds under Visible Light Irradiation.

The excellent oxidizing capability of acridinium-based organic dye (Acr+ -Mes) is fully studied in photoredox catalysis. However, its reducing ability is always considered weak for organic transformation. The reducing ability of Acr+ -Mes is developed by Selectfluor to achieve effective fluorination and oxidation of benzylic C(sp3 )-H bonds under visible light irradiation, which is not available for the direct use of oxidizing ability of excited Acr+ -Mes. Mechanistic insights provided strong evidence for the oxidative quenching of Acr+ -Mes.