[CH:1]1([O:6][C:7]2[CH:8]=[C:9]([CH:12]=[CH:13][C:14]=2[O:15][CH3:16])[CH:10]=[O:11])[CH2:5][CH2:4][CH2:3][CH2:2]1.S(=O)(=O)([OH:19])N.Cl([O-])=O.[Na+]>C(O)(=O)C.O>[CH:1]1([O:6][C:7]2[CH:8]=[C:9]([CH:12]=[CH:13][C:14]=2[O:15][CH3:16])[C:10]([OH:19])=[O:11])[CH2:2][CH2:3][CH2:4][CH2:5]1A solution of 3-cyclopentyloxy-4-methoxybenzaldehyde (66 g) and sulfamic acid (39.6 g) in glacial acetic acid (500 mL) is treated dropwise during 1 hour with a solution of sodium chlorite (35 g) in water (150 mL). The mixture is stirred at 20° C. during 1 hour and then it is treated with water (500 mL) dropwise during 30 minutes. The resulting solid is filtered, washed with water and dried, to give 3-cyclopentyloxy-4-methoxybenzoic acid (60.9 g) in the form of white crystals [Elemental analysis: C,65.8; H,6.7%; calculated: C,66.1; H,6.8%].
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