[OH:1][C:2]1[CH:9]=[CH:8][C:7]([OH:10])=[CH:6][C:3]=1[CH:4]=O.[CH:11]([CH:13]=[CH2:14])=[O:12].C(=O)([O-])[O-].[K+].[K+]>O1CCOCC1.O>[OH:10][C:7]1[CH:6]=[C:3]2[C:2](=[CH:9][CH:8]=1)[O:1][CH2:14][C:13]([CH:11]=[O:12])=[CH:4]23 g (21.7 mmol) of 2,5-dihydroxybenzaldehyde and also 2.2 ml (32.6 mmol) of acrolein are added to a suspension of 6 g (43.5 mmol) of potassium carbonate in 50 ml of 1,4-dioxane; the medium is then heated at reflux for 12 hours. The salts are filtered off over Celite; the solvent is then evaporated in vacuo. The residue obtained is taken up in water; the aqueous phase is then extracted with ether. After drying over magnesium sulphate and evaporation of the solvent in vacuo, the crude product is triturated in dichloromethane to yield the title compound in the form of a yellow solid.
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