The authors advanced a mechanism in which the PC* is oxidatively quenched by molecular oxygen and the resultant PC +• oxidizes the Cu II intermediate to Cu III , thus accelerating the reductive quenching step. Following the literature conditions, using fac-Ir(ppy)3 as the PC and 4-chlorophenylboronic acid and 4-trifluoromethylaniline as the reactants resulted in a yield of 52% of the cross-coupled product (Figure ). This result significantly deviates from the literature reported yield of 72%. The use of both mer-and fac-Ir(pmi)3 outperformed this literature PC, affording yields of 60 and 70% (Figure ), respectively.