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An efficient solvent-free procedure for the preparation of 4,4′-epoxydicoumarins via the ondensation of 4-hydroxycoumarin with aldehydes in the presence of catalytic amount of phosphorus pentoxide/silica gel at 110 °C is described. The advantages of this method are generality, high yields, short reaction times, ease of product isolation, low cost and ecologically friendly.

e-journal of chemistry

P2O5/SiO2as a New, Efficient and Reusable Catalyst for Preparation of 4,4′-Epoxydicoumarins Under Solvent-free Conditions