Propionic anhydride → HCID 15580733, compound

Participants

Reaction Steps

A mixture of 10.0 g. of 3-amino-1,5-diphenyl-2-pyrazoline (prepared in Example 4), 30.0 ml. of propionic anhydride and 500 mg. of 4-dimethylaminopyridine is heated on a steam bath for 3 hours. The mixture is poured into water to separate an oil. The oil crystallizes and the solid is collected by filtration. The solid is dissolved in dichloromethane. The solution is dried over anhydrous sodium sulfate then is columnized and recrystallized twice as for Example 26 (A) to give 6.0 g. of the product of the Example as colorless plates, m.p. 148.0°-148.5° C.

Provenance & Evidence