Running the same kinetics experiments on 4-ClBzCF3 gave more insight into the role of the chloride additive. When the reaction was performed with no external chloride, there was a noticeable induction period (Fig. ), suggesting that the byproducts of the aryl chloride coupling are non-innocent. The only byproduct of this coupling is the DBU-HCl salt, which we reasoned could be a source of chloride generated in-situ when no exogenous chloride is present. By saturating the reaction with chloride in the form of TBACl, the coupling with 4-ClBzCF3 displays pseudo-first order kinetics, suggesting that TBACl is involved in the formation of a more active catalyst species. By calculating the initial turnover frequency (TOF0) for the two cases (added chloride/no added chloride) we found that the species formed with chloride is at least 36-fold more active than the species present with no chloride. Taken together, these results further support chloride as the main contributor to the rate increase and UV-vis studies confirmed a change in nickel speciation that we hypothesize is responsible.