Given the strong photoreducing power of all four PCs, we explored their use in the challenging dehalogenation reaction of aromatic halides. Methyl 4-chlorobenzoate has a reduction potential of Ered = -2.0 V measured in MeCN (Figure ). Ph-PTZ has been reported to photoreduce this substrate in 100% yield in MeCN. Previously reported reaction conditions include the use of an amine as a sacrificial reductant to regenerate PC from PC •+ following oxidative quenching with methyl 4-chlorobenzoate. However, in order to mechanistically exclude halogen-atom transfer (XAT), where the radical cation of the sacrificial amine extracts the halogen atom from the substrate, we adjusted the reaction conditions to intercept the aryl radical with 1,3,5trimethoxybenzene (TMB).