Reaktion #214194

Reaktionsgleichung

sodium hydroxide

ethyl 2-(p-formylphenyl)propionate

cycloheptanone

→

desired product

Ausbeute 39.7%

2-[4-(2-Oxo-1-cycloheptylidenemethyl)phenyl]propionic acid

Ausbeute 39.7%

Lösungsmittel

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe resulting mixture was heated
2. 2
   Temperaturunder reflux for 3 hours
3. 3
   TemperaturAfter cooling
4. 4
   Extraktionthe reaction mixture was extracted twice with ethyl acetate
5. 5
   Extraktionextracted with ethyl acetate
6. 6
   WaschenThe extract was washed with water
7. 7
   Trocknendried over anhydrous sodium sulfate
8. 8
   workup.DISTILLATIONThe ethyl acetate was distilled off
9. 9
   Sonstigeto leave an oily substance, which
10. 10
    Waschenwas then subjected to a silica gel column chromatography and elution
11. 11
    Sonstigeto yield an yellow oily substance
12. 12
    workup.DISTILLATIONThe substance was distilled under reduced pressure

Vorschrift

To a mixture of 5.15 g of ethyl 2-(p-formylphenyl)propionate and 4.2 g of cycloheptanone were added dropwise at room temperature 30 ml of an aqueous solution of 2.6 g of sodium hydroxide and the resulting mixture was heated under reflux for 3 hours. After cooling, the reaction mixture was extracted twice with ethyl acetate, an aqueous layer was made acidic with hydrochloric acid and extracted with ethyl acetate. The extract was washed with water and dried over anhydrous sodium sulfate. The ethyl acetate was distilled off to leave an oily substance, which was then subjected to a silica gel column chromatography and elution was effected with benzene-ethyl acetate 5:1 to yield an yellow oily substance. The substance was distilled under reduced pressure to give 2.7 g of the desired product as a pale yellow oily substance having a boiling point of 210°-215° C./0.3 mmHg (bath temp.).

Quelle