反应详情

A mixture of 20.0 g. of (phenyl)formimidoylacetaldehyde and 5.0 g. of urea is heated under reflux in 50 ml. of ethanol and 10 ml. of concentrated hydrochloric acid for 5 hours. The cooled mixture is swamped with 20% aqueous ammonium hydroxide and the precipitate is collected and washed with water. The precipitate is crystallized from ethanol to give 8.0 g. of the product of the Example, m.p. 239°-241° C.

1. additionA mixture of 20.0 g
2. temperatureunder reflux in 50 ml
3. customthe precipitate is collected
4. washwashed with water
5. customThe precipitate is crystallized from ethanol
6. customto give 8.0 g