A simple, high-yield process for making menthyl lactate (ML) is disclosed.
Menthol and lactic acid react to produce a mixture comprising menthyl
lactate and one or more higher lactoyl esters of ML. Hydrolysis of the
esterification mixture follows in the presence of aqueous base under
conditions effective to convert the higher lactoyl esters to menthyl
lactate. Coincidentally, the conditions minimize hydrolysis of menthyl
lactate to menthol, thereby maximizing the overall yield of ML.