Carbamic acid, ethyl ester → Ethyl difluoroacetylcarbamate

Participants

Reaction Steps

During a thirty minute period 65.4 g (0.55 mole) of thionyl chloride was added dropwise to 50.0 g (0.52 mole) of difluoroacetic acid with stirring, while maintaining a reaction temperature of 20°-25° C. After complete addition the mixture was stirred at room temperature for 1.5 hours and 46.4 g (0.52 mole) of urethane was added. The resultant mixture was heated at reflux for approximately three hours then allowed to cool to room temperature and stir for approximately 18 hours. The reaction mixture was again heated at 77° C. for two hours. Unreacted materials were removed from the reaction mixture by evaporation under reduced pressure leaving 81.1 g of ethyl difluoroacetylcarbamate as a semi-solid residue.

Provenance & Evidence