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(a) UV–vis spectral changes observed by addition of p-Et-DTBP (20 mM) to 2 (0.27 mM) in acetone (10% MeTHF) at 183 K; kobs = 5.73 × 10–4 s–1. (b,c) Plots of kobs values against the concentrations of substrates (circles) and deuterated 2H–O substrates (squares) for p-OMe-DTBP (b) and p-Me-DTBP (c) to determine second-order rate constants and KIEs.
