反应详情

To obtain the starting material, stir 1.2 ml of a 70% solution of sodium dihydro-bis-(2-methoxyethoxy)aluminate together with 0.6 g of 3-(5-nitro-2-furyl)-1-phenylpyrazole-4-carboxylic acid and 15 ml of dioxane at 70° C for 1.5 hours. Then add thereto 0.16 ml of 15% caustic soda and 0.5 ml of water at room temperature before filtering the thus-prepared product while warm. Extract the filtered precipitate with dioxane, concentrate the combined dioxane solutions and crystallize from ethanol to obtain 4-hydroxymethyl-3-(5-nitro-2-furyl)-1-phenylpyrazole [m.p. 148° to 149° C].

1. customTo obtain the starting material
2. additionThen add
3. filtration0.16 ml of 15% caustic soda and 0.5 ml of water at room temperature before filtering the thus-prepared product
4. temperaturewhile warm
5. extractionExtract the filtered precipitate with dioxane
6. concentrationconcentrate the combined dioxane solutions
7. customcrystallize from ethanol