Chemistry of the Australian Gymnosperms—Part 5: Leaf Essential Oils of Some Endemic Tasmanian Gymnosperms:Diselma archeri, Lagarostrobos franklinii, Microcachrys tetragonaandPhyllocladus aspleniifolius

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Abstract
The steam volatile leaf oils of four endemic Tasmanian conifers have been analyzed. The leaf oil of Diselma archeri, produced in 0.6–0.8% yield, based on fresh leaves, contained α-pinene (45-73%), δ-3-carene (1-15%) and limonene as principal components. Lagarostrobos franklinii gave a leaf oil in 0.8–0.9% yield based on fresh leaves in which the major components were α-pinene (13-36%), δ-3-carene (1-17%), limonene (16-42%), 16-kaurene (3-7%), phyllocladene (4-10%) and sclarene (2-23%). A re-examination of the wood oil of this species showed it to contain methyl eugenol (74%), (E)-methyl isoeugenol (2%) and elemicin (24%). Microcachrys tetragona gave a leaf oil in 0.1–0.5% yield based on fresh leaves in which the principal components were α-pinene (44-50%) and limonene (10-13%). Phyllocladus aspleniifolius produced a leaf oil in 0.5–1% yield based on fresh leaves in which α-pinene (44-55%), phyllocladene (15-28%) and 8-β-hydroxyisopimarene (5-7%) were principal components.