[OH-].[Na+].C([O:5][C:6]1[CH:7]=[N:8][C:9]([C:12]2[CH:17]=[CH:16][C:15]([O:18][CH2:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])=[CH:14][CH:13]=2)=[N:10][CH:11]=1)C.O.C(O)(=O)C>C(O)COCCO>[OH:5][C:6]1[CH:7]=[N:8][C:9]([C:12]2[CH:17]=[CH:16][C:15]([O:18][CH2:19][CH2:20][CH2:21][CH2:22][CH2:23][CH2:24][CH2:25][CH3:26])=[CH:14][CH:13]=2)=[N:10][CH:11]=1NaOH (58.4 g) was added to a solution of 5-ethoxy-2-(4-octyloxyphenyl)pyrimidine (48 g) dissolved in diethylene glycol (300 ml), followed by keeping the mixture at 220° C. for 3 hours, allowing the resulting material to cool down, adding water and acetic acid, filtering off deposited crystals, and recrystallizing from ethanol to obtain 5-hydroxy-2-(4-octyloxyphenyl)pyrimidine (29 g, m.p.: 131.2°-132.5° C.)
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