2-(Ethoxymethylene)propanedinitrile → 5-amino-1-(2,3,4-trichlorophenyl)-1H-pyrazole-4-carbonitrile

Participants

Reaction Steps

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.

Provenance & Evidence