Cinchomeronic acid → 1H,3H-furo(3,4-c)pyridine-1,3-dione

Beteiligte Stoffe

Reaktionsschritte

A mixture of 3,4-pyridine-dicarboxylic acid (15 g) and acetic anhydride (30 ml) is refluxed for 2 hours. The acetic anhydride in excess is distilled off and the residue is purified by sublimation (123° C. at 3 mmHg) to give 10.1 g of 3,4-pyridine-dicarboxylic acid anhydride, a white solid, m.p. 74-76° C.

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