反应详情

1-Trifluoromethyl-3-(3'-methylphenyl)-3-hydroxyurea (11.7 grams; 0.05 mol) is dissolved in dioxane (75 ml) and mixed with 2N aqueous sodium hydroxide (30 ml). Ethyl chloroformate (5.7 ml; 0.06 mol) is then added dropwise to the mixture with stirring, resulting in the formation of a precipitate. The precipitate is recovered by filtration, is washed and dried to yield 2-(3'-methylphenyl)-4-trifluoromethyl-1,2,4-oxadiazolidine-3,5-dione.

1. customresulting in the formation of a precipitate
2. filtrationThe precipitate is recovered by filtration
3. washis washed
4. customdried