反应详情

Concentrated sulfuric acid (2 mL) and 0.4456 g of 2,4-dinitrophenylhydrazine (2,4-DNP) were combined in a 25-mL Erlenmeyer flask. Water was added (2 to 3 mL) dropwise with swirling until the 2,4-DNP dissolved. This was followed by 10 mL of 95% ethanol. This solution was added, dropwise with swirling, to a solution of cyclohexanone, 0.5725 g, dissolved in 20 mL of 95% ethanol. A precipitate formed within 5 minutes. The mixture was refrigerated overnight. The precipitate was filtered to yield a yellow-orange crystalline solid. The product was re-crystallized from approximately 30 mL of absolute ethanol to afford 0.4 g of cyclohexanone 2,4-dinitrophenylhydrazone as orange flakes. The yield was 95%.

1. dissolutiondissolved
2. additionThis solution was added
3. customA precipitate formed within 5 minutes
4. filtrationThe precipitate was filtered
5. customto yield a yellow-orange crystalline solid
6. customThe product was re-crystallized from approximately 30 mL of absolute ethanol