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温度

0 °C

A solution of 25 g of hydroxylamine hydrochloride and 29.4 g of anhydrous sodium acetate in 100 ml of water is added dropwise at room temperature to a solution of 68.5 g of 4-phenoxyphenoxyacetaldehyde in 300 ml ethanol. After the slightly exothermic reaction has subsided, the mixture is stirred for 2 hours at reflux temperature. The mixture is then cooled to 0° C. and stirred for 3 hours at this temperature, whereupon the resultant oxime crystallises. The crystallised 4-phenoxyphenoxyacetaldehyde oxime is isolated by suction filtration, repeatedly washed thoroughly with water and dried in a vacuum cabinet at 40° C. Melting point: 102°-105° C.

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2. temperatureat reflux temperature
3. customcrystallises