Figure 13. Mesomeric equilibrium between alcoholate anion and carbanion from 4-hydroxycoumarin

From

Review on 4-Hydroxycoumarin Chemistry: Synthesis, Acylation and Photochemical Properties

Jules Yoda, Abdoulaye Djandé, Lamine Cissé, Akoun Abou, Léopold Kaboré, Adama Saba

World Journal of Organic Chemistry. 2019, 7(1), 19-30 doi:10.12691/wjoc-7-1-4