OS(O)(=O)=O.[CH3:6][C:7]1[C:13]([OH:14])=[CH:12][CH:11]=[CH:10][C:8]=1[OH:9].C[O:16][C:17](=O)[CH2:18][C:19](=O)[C:20]1[CH:25]=[CH:24][C:23]([F:26])=[CH:22][CH:21]=1>O>[F:26][C:23]1[CH:22]=[CH:21][C:20]([C:19]2[C:10]3[C:8](=[C:7]([CH3:6])[C:13]([OH:14])=[CH:12][CH:11]=3)[O:9][C:17](=[O:16])[CH:18]=2)=[CH:25][CH:24]=1Concentrated H2SO4 (27 ml) was added to a mixture of methyl resorcinol (12.41 g, 100 mmol) and methyl-4-fluorobenzoylacetate (21.8 g, 110 mmol) at 0° C. The resulting suspension was set aside for 40 h. Water (1 L) was added and the mixture was stirred for 1 h. The residue was filtered, washed with water (2 L) and dried to give the title compound.
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