Ammonium thiocyanate → (3,5-Dimethyl-1H-pyrazol-4-YL)thiourea

Participants

Reaction Steps

19.0 grams (g) of 3,5-dimethyl-4-aminopyrazole hydrochloride and 19.7 g of ammonium thiocyanate are dissolved in 100 milliliters (ml) of water, and the resulting solution is heated at boiling under reflux for 6 hours. Then the solution is concentrated to about 50 ml and cooled. Thus-formed precipitate is separated by filtration, washed with a little water and dried to yield 17.0 g of 3,5-dimethyl-4-thioureidopyrazole, mp 209° to 211°.

Provenance & Evidence