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Mechanistic investigations. A, UV–vis absorbance of PC-1 and PC-2 in MeCN (12 μM). B, Cyclic voltammetry and Stern–Volmer relationship between PC-1* and 1a, 2a, and 2,6-lutidine; fluorescence spectra recorded in MeCN (12 μM PC-1). C, Radical scavenger experiment carried out with 1.0 equiv of TEMPO. D, Quantum yield determined on 1.0 mmol scale; 8% conversion after 120 min. E, Equilibrium involving β-dicarbonyl compounds and D2O (1.0 equiv) in d3-MeCN (0.4 M) at 40 °C.
