O[CH2:2][CH2:3][C:4]1[C:9]([CH2:10][CH2:11][OH:12])=[CH:8][CH:7]=[CH:6][C:5]=1[OH:13].Cl>O>[O:13]1[C:5]2[CH:6]=[CH:7][CH:8]=[C:9]([CH2:10][CH2:11][OH:12])[C:4]=2[CH2:3][CH2:2]1A mixture of 2,3-bis(2-hydroxyethyl)-phenol (1.2 g) and 36% aqueous hydrochloric acid (24 ml) was heated at reflux for 2 h. The mixture was cooled, diluted with water (24 ml) and extracted with ethyl acetate (2×24 ml). The combined extracts were dried (Na2SO4) and the solvent evaporated to give the title compound (1.2 g) as a brown oil.
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