Reacción #324019

Ecuación de reacción

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

potassium hydroxide

→

3-chloro-4-cyclohexylpropiolic acid

Condiciones de reacción

Tratamiento posterior

1. 1
   TemperaturaThe mixture is refluxed on a steam bath for 6 hours
2. 2
   OtroThe alcohol is evaporated
3. 3
   workup.DISSOLUTIONthe residue is dissolved in water
4. 4
   LavadoThe ether layer is washed with water, saline
5. 5
   Secadodried over sodium sulfate
6. 6
   OtroThe ether is removed
7. 7
   Otroto give a residue which
8. 8
   Otrois triturated with carbon tetrachloride
9. 9
   OtroRecrystallization
10. 10
    Otrotriturated with boiling carbon tetrachloride

Procedimiento

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.

Fuente