techniques, we were able to rapidly optimize the reactions by varying the catalyst loadings for eight substrates in a single experiment using a standard 96 well reaction plate (see SI). Aryl halides 5a-5h were successfully coupled in moderate to high yields (42-91% yield by 1 H NMR spectroscopy) with 1-bromo-3-phenylpropane using catalyst loadings between 0.5 and 5 mol% of both bpy Ni and Co Pc without altering any other reaction parameters (Figure ). The range of functional groups present in these aryl halides highlights the power of our method. For example, successful reactions were observed in the presence of esters, amides, sulfones, alcohols, triazoles, thiophenes, pyridines, and both free and protected amines among many other functional groups.