Acetic Anhydride → HCID 15580724, compound
Reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([N:8]2[CH2:12][CH:11]([CH3:13])[C:10]([NH:14][CH:15]=[O:16])=[N:9]2)=[CH:4][CH:3]=1.[C:17](OC(=O)C)(=O)C>>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([N:8]2[CH2:12][CH:11]([CH3:13])[C:10]([NH:14][C:15](=[O:16])[CH3:17])=[N:9]2)=[CH:6][CH:7]=1Participants
3
Procedure
A 9.0 g. amount of 3-amino-1-(p-chlorophenyl)-4-methyl-2-pyrazoline (prepared as described in Example 23) is dissolved in 54.0 ml. of acetic anhydride. The warm solution is allowed to stand for 16 hours at room temperature with some solid separation. The solid is collected by filtration and is dissolved in methanol. Then 1 N potassium hydroxide in methanol is added to make basic. After 15 minutes at room temperature, the solvent is removed in vacuo and water is added to separate a solid. The solid is collected and recrystallized from dichloromethane-hexane to give 6.5 g. of the desired product as white crystals, m.p. 172°-173° C.
Workup
- customto stand for 16 hours at room temperature with some solid separation
- filtrationThe solid is collected by filtration
- dissolution