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Conceptual transition between concerted and stepwise C–H activation mechanisms with a single oxidant. Boxed numbers represent measured kq for substrates 1 and 7. The blue line (ET/HAT), representing measured kq for benzoate, is independent of C–H bond strength. The red line (MS-CPET) represents the k vs. driving force relationship for thermal oxidations of substrate 1.5a,5b Inset: schematic of MS-CPET (red) and ET/HAT (blue) mechanisms.
