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Isolation of isomultiflorenol, a possible triterpenoid artefact, from Pleiococca wilcoxiana (Rutaceae)

Pleiococca wilcoxiana F. Muell, is a small tree of the family Rutaceae once found . in rain forest on the coastal strip near the New South Wales-Queensland border. Because of the clearing of its restricted habitat, P. wilcoxiana must now be considered rare. A compound, probably the triterpene alcohol multifloreno1,l was isolated from the plant extracts, but from extracts which had been heated with acid only isomultiflorenoll could be isolated. The extractions were done twenty years ago and further supplies of P. wilcoxiana are not available to enable multiflorenol to be rigidly identified. Isomultiflorenol does not appear to have been isolated directly from any natural source, but it has been obtained from multiflorenol, a triterpene alcohol from Gelonium multi$orum A. Juss. (family Euphorbiaceae) by a rearrangement involving the shift of a C 7,C 8 double bond to the C 8,C 9 position.1 Failure to isolate isomultiflorenol from extracts which had not been heated with acid indicates that it may be an artefaot, possibly derived from multiflorenol. Although isomultiflorenol may be an artefact, its isolation in high yield is of some chemotaxonomic interest.