Ethyl chloroformate → HCID 178476786, compound

Participants

Reaction Steps

A suspension of 128 g of diethoxymethyl(benzyl)phosphinic acid ethyl ester in 400 ml of hydrochloric acid is heated under reflux for 20 hours, cooled to room temperature, washed with diethyl ether/hexane (1:1) and concentrated to dryness by evaporation. The residue is taken up in dichloromethane, dried over sodium sulfate and again concentrated by evaporation. The viscous benzylphosphinic acid that remains is then dried under a high vacuum. 13.34 g of benzylphosphinic acid are dissolved in 150 ml of dichloromethane, the solution is cooled to 5°, and 8.64 g of triethylamine are added dropwise. An exothermic reaction takes place. The mixture is cooled to 5° again, and 9.3 g of chloroformic acid ethyl ester are added dropwise within a period of 30 minutes. A precipitate forms in an exothermic reaction with the evolution of gas. The mixture is allowed to warm to room temperature and is then stirred at room temperature for 3 hours, taken up in dichloromethane and washed with water, and the organic solvent is removed. The crude product is distilled under a high vacuum, yielding benzylphosphinic acid ethyl ester having a boiling point of 96°100° (5×10-6 bar).

Provenance & Evidence