Fig. 2. (a) Reaction scheme for photoketonization (step 1) and relaxation (step 2) of compounds 4a–d in MeCN. (b) Time-arrayed multi-wavelength analysis for relaxation of 4a (0.025 mM) in the dark, each spectrum acquired at 15 min intervals at 20 °C. (c) Relaxation of 4a-keto at different concentrations (0.01 mM, 0.025 mM, 0.05 mM and 0.07 mM); kobs values obtained at each concentration of 4a are shown.
