Remarkably, incorporating acidic additives, such as HFIP, TFA, and various amino acids, did not substantially impact the reactivity (see Supplementary Information, Table and). Control experiments conducted to explore the formation of donor-acceptor complexes between RAE 1a and HE, performed at 456 and 390 nm without EYNa2, either yielded no product or achieved lower yields (Table , Entries 7-8), underscoring the crucial role of the photocatalyst in photoinitiating the reaction, thus securing higher yields. Running the reaction in the dark resulted in the quantitative recovery of all starting materials (Table , Entry 9). Notably, applying the optimized conditions to the less electrophilic 4-CF3-benzaldehyde-derived sulfonyl hydrazone 2c as the radical acceptor yielded the corresponding β-arylethylamine product 46 in a 58% NMR yield. Additional screening of reaction parameters did not produce any enhancements in yield (see Supplementary Information, section 5.3).