Figure 6.

(A) Denoised spectra and a multicomponent standard calibration matrix allowed accurate determination of concentrations of 4 and 6 over time starting from varying initial concentrations. The red vertical line draws attention to a lengthening “induction” period for the formation of 6 with decreasing initial concentration. (B) Pseudo-first-order rate constant for the consumption of 4 calculated from fitting a line through log−log transformed data of initial concentrations against initial rates. (C) Evidence for o-BPP expulsion preceding the isomerization. Note different scales of the y-axes.