反应详情

A mixture of 18.5 g (0.05 m) of 4-[6-(2-chloro-4-methoxyphenoxy)hexyl]-3,5-heptanedione and 5 ml of 100% hydrazine hydrate in 100 ml of absolute ethanol was heated at reflux for five hours. The reaction mixture was concentrated in vacuo, the residue dissolved in 50 ml of ethanol, and the solution made acid with hydrochloric acid. The latter solution was concentrated in vacuo and the residue crystallized twice from an isopropyl alcohol-ether mixture to give 14.5 g of 4-[6-(2-chloro-4-methoxyphenoxy)hexyl]-3,5-diethyl-1H-pyrazole in the form of its hydrochloride salt, m.p. 117°-118° C. The corresponding hydrobromide salt had the m.p. 118°-120° C.

1. temperaturewas heated
2. temperatureat reflux for five hours
3. concentrationThe reaction mixture was concentrated in vacuo
4. dissolutionthe residue dissolved in 50 ml of ethanol
5. concentrationThe latter solution was concentrated in vacuo
6. customthe residue crystallized twice from an isopropyl alcohol-ether mixture