Facile acid-catalyzed condensation of 2-hydroxy-2,2′-biindan-1, 1′,3,3′-tetrone with phenols, methoxyaromatic systems and enols

Article abstract of DOI:10.1016/j.tet.2004.09.004

Various phenols, methoxy aromatic compounds, 3- and 4-hydroxycoumarins and enols smoothly condense with 2-hydroxy-2,2′-biindan-1,1′,3,3′- tetrone 1 in an acid medium producing 2-aryl/alkyl-2,2′-biindan-1, 1′,3,3′-tetrones in high yields. The adducts of re