[CH2:1]([O:5][C:6]1[CH:15]=[CH:14][CH:13]=[CH:12][C:7]=1[C:8]([O:10]C)=[O:9])[CH:2]([CH3:4])[CH3:3].[OH-].[Na+].C(OCC)(=O)C.Cl>CO.O>[CH2:1]([O:5][C:6]1[CH:15]=[CH:14][CH:13]=[CH:12][C:7]=1[C:8]([OH:10])=[O:9])[CH:2]([CH3:4])[CH3:3]In 20 ml of methanol is dissolved 4.1 g of methyl 2-isobutoxybenzoate. After adding 6 ml of 5 mol/L solution of sodium hydroxide, the mixture thus obtained is stirred at ambient temperature for 2 hours. Ethyl acetate and water are added to the reaction mixture, pH is adjusted to 2 with 2 mol/L hydrochloric acid, and the organic layer is separated. The organic layer thus obtained is washed with water and saturated aqueous solution of sodium chloride successively and dried over anhydrous magnesium sulfate, and then the solvent is distilled off under reduced pressure. Thus, 3.9 g of 2-isobutoxybenzoic acid is obtained as a colorless crystalline product.
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