[CH3:1][O:2][C:3]1[C:4]([C:12]([O:14]C)=[O:13])=[CH:5][C:6]2[O:10][CH2:9][O:8][C:7]=2[CH:11]=1.[OH-].[Na+].C(O)C>O>[CH3:1][O:2][C:3]1[C:4]([C:12]([OH:14])=[O:13])=[CH:5][C:6]2[O:10][CH2:9][O:8][C:7]=2[CH:11]=1A mixture of methyl 6-methoxy-1,3-benzodioxole-5-carboxylate (3 g, 14 mmol), prepared as in Example 1, 20% sodium hydroxide (50 mL) and ethanol (25 mL) was heated 1 hour at reflux and then diluted with water, washed with diethyl ether (2×), treated with concentrated hydrochloric acid and cooled in an ice-bath. The solids were collected, washed with water (2×) and dried under vacuum at 70° C. to give 6-methoxy-1,3-benzodioxole-5-carboxylic acid (2.3 g, 12 mmol), m.p. 151° C.
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