反应详情

2,3,4-Trichlorophenylhydrazine (21.15 g) was added in portions to a refluxing solution of ethoxymethylenemalononitrile (12.2 g) in ethanol (100 ml). The solution obtained was then heated at reflux for one hour, cooled and evaporated to dryness. The residue thus obtained was triturated with diethyl ether (100 ml) to give 5-amino-4-cyano-1-(2,3,4-trichlorophenyl)pyrazole (12.6 g), m.p. 158°-160° C., in the form of light brown crystals.

1. customThe solution obtained
2. temperaturewas then heated
3. temperatureat reflux for one hour
4. temperaturecooled
5. customevaporated to dryness
6. customThe residue thus obtained
7. customwas triturated with diethyl ether (100 ml)