[F:1][C:2]1[CH:21]=[CH:20][C:5]([O:6][C:7]2[CH:8]=[C:9]([C:13](=O)[CH2:14][CH2:15][C:16](=[O:18])[CH3:17])[CH:10]=[CH:11][CH:12]=2)=[CH:4][CH:3]=1>[OH-].[Na+]>[F:1][C:2]1[CH:21]=[CH:20][C:5]([O:6][C:7]2[CH:8]=[C:9]([C:13]3[CH2:14][CH2:15][C:16](=[O:18])[CH:17]=3)[CH:10]=[CH:11][CH:12]=2)=[CH:4][CH:3]=1A solution of 1-[3-(4-fluorophenoxy)phenyl]-1,4-pentanedione (19.03 g; 0.0665M) in 0.44M aqueous NaOH solution (300 ml) was refluxed for 24 hrs. After cooling, the residual solids were collected by filtration and dried to give 18 g (yield quant.) of the subtitle compound [D] as brown solids, which was used without further purification.
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