"Same excess" experiments were performed by maintaining the absolute concentration difference between nbe and arene to gain initial insights about the reaction progression. As shown in Scheme 6b, the overlay of three kinetic profiles indicates that neither catalyst deactivation nor product inhibition were occurring. Next, varying the concentration of each component, the rate of the reaction was determined to be first order in arene and catalyst, and inverse first order in nbe (see supporting information for details). Based on the above observations and by drawing analogy with previous mechanistic studies, From intermediate IV, rate-determining reductive elimination delivers V, which, upon a fast ligand exchange with nbe, regenerates the catalyst, which is in good agreement with the result from "same excess" experiments that show no product inhibition.