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Stopped-flow kinetic plots of a) 4a; b) DMPO and c) β-CD for their reaction with KO2 in DMF using phenol red (PR) as competitor, where V and v are the initial rates of formation in the absence and presence of various concentrations of the spin trap, respectively. Initial rates were obtained by monitoring the formation of UV-Vis absorption peak at 575 nm. Measurements were done at least in triplicate. See experimental section for details.
