反应详情

To a stirred mixture of 444.3 g of 3-amino-2-cyano-4-methyl-2-pentenethioamide (from part B) and 1315 ml of ethanol were added dropwise 298 g of 30% hydrogen peroxide (containing 89.4 g of active H2O2) during 1.25 hours. The reaction temperature was maintained at 30°-35° with an ice bath. The reaction mixture was stirred an additional 17.5-18 hours in an ambient temperature water bath. The reaction mixture was poured into 5100 ml of cold water with stirring. The water was cooled in an ice-water bath during addition of the reaction mixture. The mixture was stirred for one hour at 5°-10° and filtered. The filter cake was washed with 2 liters of water and allowed to dry on the suction filter. After air-drying over a weekend, 426.5 g of 5-amino-4-cyano-3-isopropylisothiazole, mp 130°-132° was obtained.

1. temperatureThe reaction temperature was maintained at 30°-35° with an ice bath
2. stirringwith stirring
3. stirringThe mixture was stirred for one hour at 5°-10°
4. filtrationfiltered
5. washThe filter cake was washed with 2 liters of water
6. customto dry on the suction
7. filtrationfilter
8. customAfter air-drying over a weekend