The enantiomeric composition and relative quantity of piperitone in laboratory‐made essential oils and in essential oils and samples of piperitone from commercial sources were determined. High enantiomeric purities of (4 R )(‐)‐piperitone were detected in Mentha longifolia (L.) Huds. (Negev type) oil. The (4 S )(+)‐enantiomer was detected in peppermint oils and in M. longifolia L. Huds. (Yizre'el Valley) oil in a high enantiomeric ratio. The presence of (4 R )(‐)‐piperitone in the oils of some Mentha species is contrary to the postulation that only the (4 S )‐enatiomer occurs naturally in the Mentha genus .
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Ravid et al. (1994) studied this question.
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