反应详情

To a suspension of 22 g of the hydrazide prepared in Example 1 in 175 ml of absolute ethanol was added a solution of 5.4 g of potassium hydroxide in 40 ml of water. After stirring several minutes, 9.2 g of carbon disulfide was added dropwise. The suspension was refluxed 4 hours then concentrated in vacuo. After water (about 200 ml) was added to the residue and the suspension stirred several minutes, the suspension was filtered, and the filtrate was acidified with concentrated hydrochloric acid (red to litmus paper). The mixture was filtered and the solid isolated was suction-dried to give 5 g of the crude subject compound; m.p. 173°-197° C.

1. temperatureThe suspension was refluxed 4 hours
2. concentrationthen concentrated in vacuo
3. additionAfter water (about 200 ml) was added to the residue
4. stirringthe suspension stirred several minutes
5. filtrationthe suspension was filtered
6. filtrationThe mixture was filtered
7. customthe solid isolated
8. customwas suction-dried
9. customto give 5 g of the crude