Enantiomeric distribution of piperitone in essential oils of some mentha spp., calamintha incána (sm.) heldr. and artemisia judaica L

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Abstract
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 (4R)(‐)‐piperitone were detected in Mentha longifolia (L.) Huds. (Negev type) oil. The (4S)(+)‐enantiomer was detected in peppermint oils and in M. longifolia L. Huds. (Yizre'el Valley) oil in a high enantiomeric ratio. The presence of (4R)(‐)‐piperitone in the oils of some Mentha species is contrary to the postulation that only the (4S)‐enatiomer occurs naturally in the Mentha genus.

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