Figure 4.

¹H NMR spectra of G2 (A) and H2 (B) in D₂O during 4 h of UV irradiation (dark gray traces). At the end of the experiment, we added methanol (+0.18 mM) to confirm its occurrence as a reaction product (orange traces). Gray areas represent CH₃OH (3.36 ppm), blue areas denote the internal standard (CH₃SO₃^–, 2.81 ppm), and orange areas represent the resonance range of ArOCH₃ protons. Additional relevant signals are indicated with a filled circle (acetate, 2.03–2.08 ppm) or an empty circle (acetone, 2.23 ppm). Note that acetone is not a reaction product. ¹H NMR spectra of other substrates are in Figure S9.