Reaktion #218246

Reaktionsgleichung

sulfuric acid

cyclohexanone

Water

2,4-DNP

2,4-dinitrophenylhydrazine

→

cyclohexanone 2,4-dinitrophenylhydrazone

Ausbeute 95.0%

Lösungsmittel

ethanol

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.DISSOLUTIONdissolved
2. 2
   workup.ADDITIONThis solution was added
3. 3
   SonstigeA precipitate formed within 5 minutes
4. 4
   FiltrationThe precipitate was filtered
5. 5
   Sonstigeto yield a yellow-orange crystalline solid
6. 6
   SonstigeThe product was re-crystallized from approximately 30 mL of absolute ethanol

Vorschrift

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%.

Quelle