Benzoic Acid → N,N-Diethylbenzamide

Temperature

-10 °C

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.

1. dissolutiondissolved
2. customExcess thionyl chloride was removed under reduced pressure
3. customleaving the crude acid chloride as a low melting solid which
4. customwas used without further purification
5. dissolutionThe crude acid chloride was dissolved in CH2Cl2(20 mL)
6. additionTo this stirred solution was added triethylamine (4 mL)
7. temperatureto warm to room temperature
8. customThe reaction mixture was transferred to a separatory funnel
9. customThe organic layer was separated
10. washwashed with 5% HCl (2×25 mL), H2O (25 ml)
11. dry with materialdried over Na2SO4
12. customThe solvent was removed under reduced pressure

ORD record

ord-28ffe9b6a0d148e18bae710867780a93

Source dataset

uspto-grants-2010_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07691292B2