Methylhydrazine → HCID 178481857, compound

Participants

Reaction Steps

To a solution of 208.6 g (1257 mmol) of ethyl 4,4-difluoro-3-oxobutanoate (VII-1) in 1000 ml of toluene was added 57.8 g (1257 mmol) of methylhydrazine by dropwise addition with cooling. After 90 min under reflux the reaction mixture was cooled down and concentrated. After 1500 ml of diethyl ether had been added, the reaction mixture was stirred and the insoluble material was filtered off. The filtrate was concentrated to obtain 137.5 g (74% of theory) of 3-(difluoromethyl)-1-methyl-1H-pyrazol-5-ol (IX-1) as a reddish orange solid which was used in the next reaction step without further purification.

Provenance & Evidence