Abstract
A chemical study of the leaves of the southern evergreen Magnolia virginiana provided, besides the known sesquiterpene lactones costunolide, parthenolide and trifloculoside, two new sesquiterpenes, costunolact-12β-ol and its acetal dimer. The molecular structure of the acetal dimer of costunolact-12β-ol was determined by single crystal X-ray diffraction. An annual study of the relative ratios of the major sesquiterpenes in leaves of M. virginiana showed < 10% of costunolide over the 12 month period. In contrast, parthenolide and costunolact-12β-ol varied markedly over the same time period with a maximum of > 90% of parthenolide in July/August and a minimum of < 20% in January. However, no lignans typical of the northern variety of M. virginiana could be detected in the annual study of the southern variety of this taxon.
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