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(A) Change in the UV–vis spectrum of 3 (0.2 mM) upon addition of 1 equiv of BNAH in acetonitrile at −10 °C. (B) Plot of 1/[3] vs time (s) for the reaction of 3 with BNAH or BNAD for the determination of k2 values. (C) Change in absorbance at 465 nm of 2/3 in the presence of an excess amount of 9,10-DHA at −10 °C. (D) Plot of log k2′ vs C–H bond dissociation energy of the substrates.
