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Scanning electron microscopy analysis of the isolated material from the reaction supports heterogeneous palladium as the active catalyst. The reaction can also be carried out with commercially available Pd\/C catalysts, which feature a scope including previously failed substrates. A range of mechanism experiments and density functional theory calculations provide support for a catalytic cycle involving heterogeneous palladium. The potential of a favorable Pd(0) oxidative addition to a C\u2013H bond vs a concerted metalation deprotonation from a more oxidized form of palladium is of particular interest. 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