[OH:1][C:2]1[CH:11]=[C:10]([O:12][CH2:13][C:14]([F:20])([F:19])[C:15]([F:18])([F:17])[F:16])[CH:9]=[CH:8][C:3]=1[C:4]([O:6]C)=[O:5].[OH-].[K+].Cl>CO.O>[OH:1][C:2]1[CH:11]=[C:10]([O:12][CH2:13][C:14]([F:19])([F:20])[C:15]([F:16])([F:17])[F:18])[CH:9]=[CH:8][C:3]=1[C:4]([OH:6])=[O:5]To a solution of methyl 2-hydroxy-4-(2,2,3,3,3-pentafluoropropoxy)benzoate (obtained in example 1) (0.72 g, 2.40 mmol) in MeOH (9.7 mL), KOH (0.51 g, 86%; 7.80 mmol) dissolved in H2O (3 mL) was added and the resulting mixture was refluxed for 4 hours. The mixture was allowed to cool and MeOH was evaporated. The residue thus obtained was treated with H2O (5 mL) and the resulting solution was acidified with 6 N HCl. The white solid formed was collected by filtration, washed with cold H2O and dried in vacuo, yielding the title compound (55% yield).
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