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The steam-volatile leaf oils of Eriostemon obovalis A. Cunn. and Phebalium glandulosum subsp. glandulosum Hook. (Rutaceae) contain substantial amounts of methyl p-methoxycinnamate and (+)-2,6-dimethyloct-7-en-4-one respectively. In the course of our survey of the Australian essential-oil-bearing flora, we investigated the volatile oils of Eriostemon obovalis A. Cunn. and Phebalium glandulosum subsp. glandulosum Hook. foliage. Both species belong to the family Rutaceae, tribe Boroniae, subtribe Eriostemoninae. Eriostemon obovalis is a small white flowering shrub growing to a height of about 1 m on exposed sandstone clifftops in the Blue Mountains of New South Wales.' Steam distillation of dried leaf material collected at Walls Lookout in the Blue Mountains National Park yielded a volatile oil which deposited on standing white plates shown by spectral evidence and synthesis to be methylp-methoxycinnamate (1). To our knowledge this is the first occurrence of (1) in an essential oil, although it has been isolated as a fungal metabolite2 and as an artefact from the methanol extraction of a plant rich in p-methoxycinnamic acid (2).3

Occurrence of some unusual compounds in the leaf oils of Eriostemon obovalis and Phebalium glandulosum subsp. glandulosum