Furthermore, the reaction of different benzothiazole derivatives with diphenylphosphine oxide obtained the desired products (10a-10e) in moderate to good yields (65%-87%) (Figures ). We proposed a mechanism for the construction of C-P bond. The excited state K-1* interacted with A and deprotonated to give a radical B and a radical cation C. Then, the radical cation C was oxidized by O2 and regenerated ground state D to complete the photocatalytic cycle. Meanwhile, radical species B attacked benzothiazole E to furnish radical intermediate F, which underwent rearomatization by oxidation and deprotonation to obtain the final product (Scheme 2).