Reaktion #725875

Reaktionsgleichung

diethylamine

thionyl chloride

benzoic acid

benzoic acid

→

N,N-diethyl benzamide

Lösungsmittel

H2O

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.DISSOLUTIONdissolved
2. 2
   SonstigeExcess thionyl chloride was removed under reduced pressure
3. 3
   Sonstigeleaving the crude acid chloride as a low melting solid which
4. 4
   Sonstigewas used without further purification
5. 5
   workup.DISSOLUTIONThe crude acid chloride was dissolved in CH2Cl2(20 mL)
6. 6
   workup.ADDITIONTo this stirred solution was added triethylamine (4 mL)
7. 7
   Temperaturto warm to room temperature
8. 8
   SonstigeThe reaction mixture was transferred to a separatory funnel
9. 9
   SonstigeThe organic layer was separated
10. 10
    Waschenwashed with 5% HCl (2×25 mL), H2O (25 ml)
11. 11
    Trocknendried over Na2SO4
12. 12
    SonstigeThe solvent was removed under reduced pressure

Vorschrift

A mixture of thionyl chloride (6 mL) and the benzoic acid was heated at reflux until the starting benzoic acid dissolved. Excess thionyl chloride was removed under reduced pressure leaving the crude acid chloride as a low melting solid which was used without further purification. The crude acid chloride was dissolved in CH2Cl2(20 mL) and cooled to −10° C. To this stirred solution was added triethylamine (4 mL), followed by the dropwise addition of diethylamine (1.4 equivalents). The heterogeneous reaction mixture was allowed to warm to room temperature and was stirred for 30 minutes. The reaction mixture was transferred to a separatory funnel containing H2O (20 mL). The organic layer was separated and washed with 5% HCl (2×25 mL), H2O (25 ml), and dried over Na2SO4. The solvent was removed under reduced pressure to afford the product N,N-diethyl benzamide.

Quelle