Hydrazine hydrate (1:1) → HCID 178478298, compound

Participants

Reaction Steps

A mixture of 1-(4-chloro-2-thienyl)-3-(dimethylamino)prop-2-en-1-one (24.6 mmol) and hydrazine hydrate (49.2 mmol) in 25 mL ethanol was refluxed for 15 h and then allowed to cool to room temperature. The solvent was evaporated under reduced pressure and dried in vacuum to afford 4.5 g (99% yield) 3-(4-chloro-2-thienyl)-1H-pyrazole which was used in the next step without further purification.

Provenance & Evidence