反应详情

温度

5 °C

In 100 ml of acetic acid is dissolved 50 g (0.184 mol, uncorrected for purity) of the crude p-nitrobenzyl γ-chloroacetoacetate obtained in 1), and the solution is cooled to 5° C. or lower, and a solution of 12.7 g (0.184 mol) of sodium nitrite in 50 ml of water is added dropwise thereto at 5° C. or lower over a period of an hour. After completion of the addition, the mixture is stirred for 30 minutes and poured into 600 ml of ice water and extracted with 300-ml and 200-ml portions of ethyl acetate. The organic layers are combined and washed with saturated aqueous sodium chloride, dried over sodium sulfate and concentrated to dryness to give 54.0 g of p-nitrobenzyl α-hydroxyimino-γ-chloroacetoacetate as an oil.

1. customobtained in 1), and the solution
2. waitat 5° C. or lower over a period of an hour
3. additionAfter completion of the addition
4. extractionextracted with 300-ml and 200-ml portions of ethyl acetate
5. washwashed with saturated aqueous sodium chloride
6. dry with materialdried over sodium sulfate
7. concentrationconcentrated to dryness