[C:1]([O:7][CH3:8])(=[O:6])[CH2:2][C:3]([CH3:5])=[O:4].C(O[CH:13]([CH3:16])[CH:14]=O)(=O)C>[Fe].CO>[CH3:8][O:7][C:1]([C:2]1[CH:14]=[C:13]([CH3:16])[O:4][C:3]=1[CH3:5])=[O:6]27 parts by weight of anhydrous iron-III chloride are added to a solution of 116 parts by weight of methyl acetoacetate in 120 parts by weight of methanol and thereafter 149 parts by weight of 85.5 percent strength α-acetoxypropionaldehyde are added dropwise, sufficiently slowly that the temperature does not rise above 37° C. The mixture is stirred overnight at room temperature (20° C.), is then boiled for 2 hours, and, when it has cooled, is worked up as described in Example 1. Distillation gives 116.6 parts by weight of 2,5-dimethylfuran-3-carboxylic acid methyl ester.
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