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Citric acid and malic acid are renewable organic acids with considerable market size. The reaction between the two acids in sulfuric acid at 80 °C gave an unexpected pyrone diacid. A mixture of dimethyl malate and trimethyl citrate gave a pyrone diester. These pyrones were produced in good yields on a multigram scale. The pyrone diacid represents a potentially useful monomer. Molecular electrostatic potential surfaces and dipole moments were calculated for ethyl butyrate and 4-hydroxy-6-methyl-alpha-pyrone.

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