反应详情

17 g (50 mmols) of ethyl 2-phenyl-3-(3,5-dichloro-1-methylpyrazol-4-yl)-3-hydroxyacrylate was dissolved in 50 ml of 6 N HCl and 250 ml of 1,4-dioxane, and heated under reflux for 15 hours. The reaction mixture was poured into 500 ml of ice water, and precipitated crystals were taken out through filtration to obtain 8 g of the intended 1-(3,5-dichloro-1-methylpyrazol-4-yl)-2-phenylethanone as white crystals. m.p.: 94-96° C.

1. temperatureunder reflux for 15 hours
2. customprecipitated crystals
3. filtrationwere taken out through filtration