To obtain a general understanding of ligand classes that, upon complexation with CeF4, facilitate a productive ligand-to-metal charge transfer (LMCT) reaction cascade, we conducted a screening (Scheme 4, Table ). The proposed LMCT activation proved synthetically applicable only for phosphate ligands (Table , entry e), hydroxamic acids (entry j), bromide anions (entry m) and benzoic acid derivatives (entry q). In cases involving other ligand classes, either no charge transfer band arose upon complexation, or a LMCT process did not lead to product formation, e.g., because radical recombination after LMCT outpaced diffusion rates. Consequently, the observation of a colour change upon complexation of the ligands with CeF4 did not enable the prediction of the transformation efficiency.