[C:1]1([CH:8]=[CH:7][CH:6]=[C:4]([OH:5])[CH:3]=1)[OH:2].C1(C)C=CC(S(O)(=O)=O)=CC=1.O.O[CH2:22][C:23]1[C:24](CO)=[C:25]([CH3:31])[C:26]([OH:30])=[CH:27][C:28]=1[CH3:29]>C1(C)C=CC=CC=1.C(O)(=O)C>[OH:2][C:1]1[CH:8]=[CH:7][C:6]([CH2:22][C:23]2[CH:24]=[C:25]([CH3:31])[C:26]([OH:30])=[CH:27][C:28]=2[CH3:29])=[C:4]([OH:5])[CH:3]=1
22.02 g of resorcinol, 1.90 g of p-toluene sulfonic acid, and 44.04 g of water are put in a 100 ml 4-necked flask, and 7.61 g of 4-hydroxymethyl(hydroxymethyl)-2,5-Xylenol is partly added thereto for one hour while maintaining at room temperature of 25° C. The mixture is reacted for 3 hours at the same temperature. Then, 50 g of acetic acid and 50 g of toluene are added to the reaction mass, separating a phase. The obtained organic layer is washed and concentrated. The obtained precipitate is filtered. The filtered product is rinsed with toluene, dried under reduced pressure for 24 hours, and treated through liquid chromatography, obtaining 7.94 g of 1,3-dihydroxy-4-(4-hydroxy-2,5-dimethyl benzyl)benzene having a purity of 99%.
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