反应详情

Phthalic anhydride (7.4 g) was dissolved in hot acetic acid (50 ml) and a solution of methylhydrazine (2.7 ml) in water (50 ml) was added. The mixture was heated under reflux for 15 minutes and left to cool overnight. The precipitate that formed was filtered off, washed with water and dried under reduced pressure at 65° C. to yield 1,2-dihydro-4-hydroxy-2-methyl-1-oxophthalazine (7.6 g) as a white solid. m.p. 243-244° C.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 15 minutes
3. waitleft
4. temperatureto cool overnight
5. customThe precipitate that formed
6. filtrationwas filtered off
7. washwashed with water
8. customdried under reduced pressure at 65° C.