Stern-Volmer quenching studies were conducted using the model system of methyl 4chlorobenzoate and DIPEA. To our surprise, no discernible quenching could be observed for These studies lead us to conclude that the family of DMAC-TRZ derivatives photodegrades into species that are sufficiently photoreducing to promote the dehalogenation of the aryl halides; we were unable to either isolate or characterize these photodegradation products. The poor photostability observed for all PCs investigated, including literature PCs, raises the question of whether these compounds can be classified as PCs, or whether they are better described as pre(photo)catalysts.