No product was observed in the absence of light and only traces in the absence of potential (4%) or TPA e-PRCat (2%), confirming the operation of e-PRC. Generally, the yield of 3aa increased with increasing oxidation half-wave potentials (E1/2) of the TPA (Figure and Table , entries 1-3), suggesting that the TPA .+ 's excited state potential is more relevant to success than the steady-state concentration of electrogenerated radical cation. Interestingly, tri([1,1'-biphenyl]-4-yl)amine (TpBPA) afforded a notably higher yield of 3aa than the commercial tris(4-bromophenyl)amine (entry 4) despite having an appreciably lower E1/2.