Iso-Citrals and Iso-Geraniols in Lemon-Myrtle (Backhousia citriodoraF. Muell.) Essential Oils

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Abstract
The essential oils from Backhousia citriodora contain the major ingredients, neral (37–39%) and geranial (44–49%). Other compounds not previously described in these oils were the iso-citrals, exo-isocitral (0.1%), (Z)-iso-citral (2.5–2.6%) and (E)-iso-citral (3.6–3.7%) and the iso-geraniols, (Z)-iso-geraniol (0.6%) and (E)-iso-geraniol (0.1–0.3%). These iso-compounds were formed from rearrangement of neral and geranial. Both distilled oils and headspace samples contained the iso-citrals but iso-geraniols were not detected in the headspace samples. These results confirm previous findings that the citral-rich B. citriodora oils contain iso-citrals and iso-geraniols as minor products.