Hydrochloric Acid → Desmethylamino Methoxy (E)-Metominostrobin
Reaktionsgleichung
[CH3:1][O:2]/[N:3]=[C:4](\[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:5]#N.Cl.[C:21](=O)(O)[O-:22].[Na+].C[OH:27]>>[CH3:21][O:22][C:5](=[O:27])/[C:4](/[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:3]/[O:2][CH3:1]Komponenten
5
Versuchsvorschrift
To E-α-methoxyimino-2-phenoxyphenylacetonitrile (a mixture of E- and Z-isomers) (0.76 g, 0.003 mole) was added hydrochloric acid in methanol (4.5 ml) and the mixture was stirred under reflux for 22 hours. After completion of the reaction, 8% aqueous solution of sodium bicarbonate (100 ml) was added to the reaction mixture and extracted with methylene chloride. The extract was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting residue was purified by silica gel chromatography (ethyl acetate/n-hexane) to obtain E-α-methoxyimino-2-phenoxyphenylacetic acid methyl ester (0.40 g, 46.7%) as colorless crystals (melting point: 109°-110° C.).