Fig. 6. Extending the photochemistry to unsubstituted 4-hydroxycoumarins. Reactions performed using 6 (0.2 mmol), 7 (0.6 mmol), Cs₂CO₃ (2 equiv.) in 1 mL of CH₃CN under illumination by a single Kessil lamp (λ_max = 390 nm, irradiance = 100 mW cm⁻²). Yields of the isolated products 7 are reported below each entry. R_F: perfluoroalkyl chain.