The coordination to CeF4 and subsequent reaction steps demonstrated optimal performance for hydroxamic acid 5 (Table 3 entry a) and phosphates (Table , entries b, c, e, f). Interestingly, the electron density and the resulting pKa change of the tested para-substituted benzoic acid core structures had only little impact on the efficiency of LMCT-derived oxygencentred radical formation and the overall photoreaction (entries g, h, i). Next, 1,1´-binaphthyl-2,2´-diyl hydrogen phosphate (7) was further investigated as ligand in the light-induced bond-homolysis with Ce 4+ (Scheme 5) and the results were compared to those obtained using benzoic acid as a catalyst for hydrogen atom abstraction.