(2R, 6S, 10S)-6, 10, 14-Trimethylpentadecan-2-ol [(2R,6S,10S)-5], one of the stereoisomers of the sex pheromone of Corcyra cephalonica Stainton, was synthesized in highly optically pure form by the hydrolysis of the 2,2,2-trichloroethyl carbonate of (2R,6S,10S)-6, 10, 14-trimethylpentadecan-2-ol [(2RS, 6S, 10S)-15a] with Pseudomonas fluorescens lipase. The same method led to sterochemically pure (2R,8R)-8-methyldecan-2-yl propionate [(2R,8R)-24], which is a component of the sex pheromone of Diabrotica species.