反应详情

A solution of 4.72 g of 2-[2-(2,5-dimethylphenoxymethyl)phenyl]-2-difluoromethoxyimino-acetonitrile in 15 ml of acetone is added dropwise to a solution of 4.88 g of hydrogen peroxide-urea adduct and 0.20 g of potassium carbonate in 15 ml of water and the reaction mixture is stirred at room temperature for 16 hours. The reaction mixture is then diluted with water and the precipitated crystalline material is filtered off with suction. Chromatography on silica gel with hexane/ethyl acetate (3:1) yields pure 2-(2,5-dimethylphenoxymethyl)-phenylglyoxalic acid amide O-difluoromethyl oxime in the form of white crystals; m.p. 153°-156° C.

1. filtrationthe precipitated crystalline material is filtered off with suction