[OH:1]/[N:2]=[C:3](\[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=1[O:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)/[C:4](O)=[O:5].[CH3:20][O-:21].[Na+].[CH3:23]OS(OC)(=O)=O.Cl>CS(C)=O.C1(C)C=CC=CC=1.O>[CH3:20][O:21][C:4](=[O:5])/[C:3](/[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][C:8]=1[O:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[N:2]/[O:1][CH3:23]To a solution of E-α-hydroxyimino-2-phenoxyphenylacetic acid (10.00 g, 0.0389 mole) in dimethyl sulfoxide (50 ml) and toluene (50 ml) was added sodium methoxide (4.83 g, 0.0894 mole) with stirring under ice cooling, and the mixture was stirred at room temperature for 20 minutes and then cooled. Dimethylsulfate (11.28 g, 0.0894 mole) was added at 6°-18° C. over 6 minutes, followed by stirring at room temperature for 4.5 hours. After completion of the reaction, conc. hydrochloric acid (1.2 ml) and water (100 ml) were added to the reaction mixture with stirring under ice cooling, followed by extraction with toluene. The extract was washed with water and concentrated under reduced pressure, and then the resulting residue was recrystallized (methanol) to obtain E-α-methoxyimino-2-phenoxyphenylacetic acid methyl ester (8.11 g, yield: 73.1%) as colorless crystals (melting point: 107°-109° C.).
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