反应详情

A mixture of 6.06 g (0.02 mole) of 6-(3,5-dichloro-4-methylphenyl)-4-methylthio-4,5-dihydro-3(2H)pyridazinone, prepared as described in Example 1(d), 20 ml of water and 5.2 ml of concentrated hydrochloric acid was heated under reflux for 2 hours. The mixture was then cooled and the resulting crystals were collected by filtration, air-dried, washed with a small amount of ethyl acetate and again air-dried, to give 4.59 g (yield 90%) of the desired 6-(3,5-dichloro-4-methylphenyl)-3(2H)pyridazinone, melting at 254°-258° C.

1. customprepared
2. temperaturewas heated
3. temperatureunder reflux for 2 hours
4. temperatureThe mixture was then cooled
5. filtrationthe resulting crystals were collected by filtration
6. customair-dried
7. washwashed with a small amount of ethyl acetate
8. customagain air-dried