Acetic Anhydride → Furo(3,2-b)furan-2,5-dione, 3,6-diphenyl-

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Reaction Steps

Pulvinic acid (19.0 g., 0.0616 m.) is refluxed in 250 ml. of acetic anhydride for 15 minutes. The cooled solution is stirred into 1200 ml. of ice and water and the oily mass crystallized by stirring in 500 ml. of ethanol. The yellow solid is removed, washed with ethanol and dried to yield pulvinic acid lactone, m.p. 221.5° -223° C.

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