Réaction #54842

Équation de réaction

ethyl α,β-dibromo-β-(3-chloro-4-cyclohexyl)propionate

potassium hydroxide

→

3-chloro-4-cyclohexylpropiolic acid

Conditions de réaction

Traitement

1. 1
   TempératureThe mixture is refluxed on a steam bath for 6 hours
2. 2
   AutreThe alcohol is evaporated
3. 3
   workup.DISSOLUTIONthe residue is dissolved in water
4. 4
   LavageThe ether layer is washed with water, saline
5. 5
   Séchagedried over sodium sulfate
6. 6
   AutreThe ether is removed
7. 7
   Autreto give a residue which
8. 8
   Autreis triturated with carbon tetrachloride
9. 9
   AutreRecrystallization
10. 10
    Autretriturated with boiling carbon tetrachloride

Mode opératoire

Powdered ethyl α,β-dibromo-β-(3-chloro-4-cyclohexyl)propionate (33.0 g.) is added portion-wise to 20% ethanolic potassium hydroxide (135 ml) at room temperature. The mixture is refluxed on a steam bath for 6 hours. The alcohol is evaporated and the residue is dissolved in water and covered with ether and is acidified with cold, dilute hydrochloric acid. The ether layer is washed with water, saline, and dried over sodium sulfate. The ether is removed to give a residue which is triturated with carbon tetrachloride. Recrystallization is carried out from acetic acid-water. This material is digested and triturated with boiling carbon tetrachloride to give 3-chloro-4-cyclohexylpropiolic acid.

Source