Chao S, Lu G, Wu L. Amberlyst-15 Catalyzed Synthesis of 12-Aryl-12H-benzo[i][1,3]-dioxolo[4,5-b]xanthene- 6,11-diones and 14-Aryl-14H-dibenzo[a,i]xanthene-8,13-diones under Solvent-Free Condition. ajc [Internet]. 2011 Jun. 8 [cited 2024 Nov. 23];23(9):3865-9. Available from: https://asianpubs.org/index.php/ajchem/article/view/10752