Lapachol type naphthoquinones were extracted from the heartwood of Paulownia kawakamii. Compounds were identified using spectral analysis including NMR experiments. A mixture of α-lapachone, 9-hydroxy-α-lapachone and β-sitosterol was obtained including lapachol and paulownin. This study provides a...

Seven new and three known bisresorcinols, grevirobstol A (=5,5′-((6Z,9Z)-hexadeca-6,9-diene-1,16-diyl)bisresorcinol; (8), 5,5′-[(8Z)-hexadec-8-ene-1,16-diyl]bisresorcinol (9), and 2-methyl-5,5′-[8Z)-hexadec-8-ene-1,16-diyl]bisresorcinol (10) were isolated from the stems of Grevillea glauca. The new ...

This paper reports the isolation of 8 secondary metabolites from Grevillea robusta collected from Queensland, Australia. The chemotaxonomic significance of the compounds is also discussed.

This work is part of a series of chemical investigations of the genus Grevillea. Two new arbutin derivatives, seven new bisresorcinols, including a mixture of two isomers, three known flavonol glycosides, and four known resorcinols, including a mixture of two homologous compounds, were isolated...

Three 2-naphthaldehydes, including the novel 4-hydroxy-3,5-dimethoxy-2-naphthaldehyde, the simple naphthoquinone plumbagin and the dimeric naphthoquinones diospyrin and 8′-hydroxyisodiospyrin have been isolated from the roots of Diospyros assimilis and their structures established by spectroscopic...

A new coumarin, 8,4″-dihydroxy-3″,4″-dihydrocapnolactone-2′,3′-diol (1) and two known triterpenes, 5(6)-gluten-3-one (2) and 5(6)-gluten-3α-ol (3) were isolated from the leaves of Micromelum minutum (Rutaceae) collected from Sepilok, Sabah, Malaysia and their structures were characterized by...

A reinvestigation of the stem bark of C. glauca (collected from Cameroon) yielded 14 compounds, of which 7 were either novel or had not been previously reported from this species. These were identified as: the farnesane sesquiterpene methyl-(2E,6E)-10-oxo-3,7,11-trimethyl-dodeca-2,6-dienoate; the...

In a continuation of our study of the Rutaceae, detailed chemical investigation on Micromelum minutum (Rutaceae) collected from Sepilok, Sabah, Malaysia gave four new coumarins. The structures of the coumarins have been fully characterised by spectroscopic methods as 3″,4″-dihydrocapnolactone 1,...

Samples of stem and root bark of Merrillia caloxylon (Rutaceae), a rain forest tree found only in S. Thailand, the Malay Peninsula and Sumatra, yielded 3 classes of metabolites supporting the suggestion that the taxon is closely allied to Murraya paniculata. The metabolites isolated were: the...

Piptostigma fasciculata is a tree to 20 m tall indigenous to the humid forests of West Africa. An analysis of n-hexane extracts of leaves collected in Ghana yielded a known diterpene (trans-phytol), a known sesquiterpene (β-caryophyllene oxide) and a known flavonol glycoside...