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(A) Change in the UV–vis spectrum of 3 (0.25 mM) upon addition of 1 equiv of 4-OMe-DTBP in acetonitrile at −45 °C. (B) Plot of log k2 vs σp+ of 4-X-DTBP substrates at −45 °C. (C) Plot of log k2 vs O–H BDE of 4-X-DTBP at −45 °C. (D) Plot of (RT/F) ln k2 vs Eox of 4-X-DTBP substrates. k2 values were measured at −45 °C.
