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Fig. 2. (a) Spectral absorption change upon addition of TBAF to a THF solution of 1a (1.2 × 10–5 M) and (b) Job plot of 1a with TBAF, where the parameter χ is defined by χ = [1a]0/([1a]0 + [TBAF]0). In this experiment: [1a]0 + [TBAF]0 = 1.2 × 10–5 M.