Triethylamine → O-(+)-menthyl dichlorophosphate

Participants

Reaction Steps

A solution of 7.5 g (48 mmol) of (1S, 2R, 5S)-(+)-menthol (Aldrich) and 4.86 g (48 mmol) of triethylamine in 20 ml of toluene was dropped into 7.36 g (48 mmol) of POCl3 at 0° C. The entire solution was stirred for 23 hours at room temperature. The insoluble triethylamine hydrochloride was filtered and the solvent was evaporated. Yield 99%, 31P NMR δ 6.76 (CDCl3). (lit. T. Milobedzki, W. Janczak, Roczniki Chemji 11, 840 (1931)).

Provenance & Evidence