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. 2020 Sep 17;59(48):21640–21647. doi: 10.1002/anie.202008384

Figure 2.

Figure 2

Racemization (▪) of compound 8 a to rac‐8 a in MeCN as the solvent: Time profile (c=1.5 mm) for λ exc=405 nm in the absence (•) and in the presence (▪) of 0.15 mm thioxanthen‐9‐one (left); time profile for λ exc=350 nm in the absence (▪) and in the presence of piperylene (right, 15 mm: •; 30 mm: ▴).