Michael Moir

Naphthaquinones in Lomatia species

Abstract Lomatiol, juglone, β-hydrojuglone and naphthazarin have been found distributed in various parts of six Lomatia spp. Three others contained no quinonoid pigments but the leaves of L. dentata yielded kaempferol-3-methyl ether and quercetin-3-methyl ether.

Naturally occurring quinones. Part XXII. Terpenoid quinones in Cordia spp.

Cordiachromes A–F are terpenoid benzoquinones isolated from the heartwood of Cordia millenii. Cordiachrome C (3; R = H) has a benzogeijerene and A (1; R = H) and B (2; R = H) have a benzocogeijerene skeleton. Cordiachromes D–F are methoxy-derivatives of A–C, respectively. All six are optically inactive. Biogenetically they appear to be related to alkannin, which occurs in the same family (Boraginaceae). The distribution of cordiachromes in other Cordia spp. is surveyed.

Tingenone and hydroxytingenone, triterpenoid quinone methides from Euonymus tingens

Spectroscopic and crystallographic studies have established that the pigment tingenone is a triterpenoid quinone methide closely related to pristimerin. A second pigment isolated from E. tingens is 20-hydroxytingenone.

A new cinnamaldehyde from Patagonula americana

Abstract The heartwood of Patagonula americana contains 3-hydroxy-2,4,5,6-tetramethoxy- trans -cinnamaldehyde (patagonaldehyde).

Naturally occurring quinones. Part XXIII. Cordiachromes from Patagonula americana L.

Two optically active (–) pigments, cordiachrome G (4) and leucocordiachrome H (7), have been isolated from the wood of Patagonula americana. They have the same benzogeijerene skeleton as cordiachrome C with an additional chiral centre; leucocordiachrome H is a quinol.