Reaktion #1679

Reaktionsgleichung

3-(3-chlorobenzoyl)propionic acid

potassium hydroxide

hydrazine

→

product

Ausbeute 90.8%

4-(3-chlorophenyl)-butyric acid

Ausbeute 90.8%

Lösungsmittel

diethyleneglycol

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeTo a 300 ml round-bottomed flask equipped with magnetic stirrer
2. 2
   Temperaturreflux condenser
3. 3
   TemperaturThe mixture was heated
4. 4
   Sonstigewas azeotroped off into a Dean-Stark trap
5. 5
   TemperaturThe reaction was refluxed for an additional 2 hours
6. 6
   Temperaturcooled
7. 7
   workup.ADDITIONpoured into 500 g of ice with 50 ml of con
8. 8
   SonstigeA white precipitate was formed which
9. 9
   Extraktionwas extracted into 400 ml of ethyl ether
10. 10
    Waschenwashed with 100 ml of water and 100 ml of saturated sodium chloride solution
11. 11
    ExtraktionThe ether extract
12. 12
    Trocknenwas dried over anhydrous magnesium sulfate
13. 13
    Filtrationfiltered

Vorschrift

To a 300 ml round-bottomed flask equipped with magnetic stirrer and reflux condenser was charged 23.7 g of 87% potassium hydroxide and 150 ml of diethyleneglycol, With stirring, 23 g of 3-(3-chlorobenzoyl)propionic acid was added followed by 24 g of 85% hydrazine. The mixture was heated to reflux for 2 hours when 50 ml of solvent was azeotroped off into a Dean-Stark trap. The reaction was refluxed for an additional 2 hours, cooled, and poured into 500 g of ice with 50 ml of con. hydrochloric acid. A white precipitate was formed which was extracted into 400 ml of ethyl ether, and washed with 100 ml of water and 100 ml of saturated sodium chloride solution. The ether extract was dried over anhydrous magnesium sulfate, filtered, and stripped to yield 19.5 g of product as a white solid.

Quelle