Reaktion #8314

Reaktionsgleichung

4-benzyl-dihydrofuran-2-one

HBr

→

3-benzyl-4-bromo-butyric acid

Lösungsmittel

acetic acid

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturThe mixture is cooled to room temperature
2. 2
   Extraktionextracted with chloroform (2×30 mL)
3. 3
   WaschenThe combined organic extracts are washed with water and brine
4. 4
   Trocknendried with anhydrous sodium sulfate
5. 5
   Filtrationfiltered
6. 6
   Einengenconcentrated in vacuo

Vorschrift

A mixture of 4-benzyl-dihydrofuran-2-one (1.0 g, 5.6 mmol), acetic acid (1.7 mL), HBr (33% in acetic acid, 2.0 mL) is heated at 80° C. for 4 h. The mixture is cooled to room temperature, poured into ice-water (20 mL), and extracted with chloroform (2×30 mL). The combined organic extracts are washed with water and brine, dried with anhydrous sodium sulfate, filtered, and concentrated in vacuo to yield 3-benzyl-4-bromo-butyric acid, 1.5 g (99%), as a colorless liquid.

Quelle