[CH2:1]([O:3][C:4](=[O:16])[CH2:5][CH2:6][CH2:7][O:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=1[I:15])C.[OH-].[Na+]>CO>[CH3:1][O:3][C:4](=[O:16])[CH2:5][CH2:6][CH2:7][O:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=1[I:15]Under the conditions of example 5A, 1 g of 4-(2-iodophenoxy)-butyric acid ethyl ester in 10 ml of methanol and 10 ml of 1 n sodium hydroxide solution is saponified, worked up, and 900 mg of 4-(2-iodophenoxy)-butyric acid methyl ester with a melting point of 66.5°-67° C. is obtained.
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