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4-Hydroxy coumarin on electrophilic substitution reaction with carbonyl compound in the presence of heterogeneous catalysts (NaHSO4·SiO2/Indion 190 resin) offers bis-(4-hydroxycoumarin-3-yl) methanes in good to excellent yields

journal of saudi chemical society

Silica supported sodium hydrogen sulfate and Indion 190 resin: An efficient and heterogeneous catalysts for facile synthesis of bis-(4-hydroxycoumarin-3-yl) methanes