Hydrazine hydrate (1:1) → HCID 178419313, compound

Participants

Reaction Steps

A mixture of 1-(4,5-dibromo-2-thienyl)-3-(dimethylamino)prop-2-en-1-one (9.6 mmol) and hydrazine hydrate (14.3 mmol) in 22 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 2.94 g (100% yield) 3-(4,5-dibromo-2-thienyl)-1H-pyrazole which was used in the next step without further purification.

Provenance & Evidence