Abstract
The wood of seven of the eighteen species of Diospyros examined contains small amounts of a blue pigment, diosindigo A [8,8′-dihydroxy-4,4′-dimethoxy-6,6′-dimethyl-2,2′-binaphthylidene-1,1′-quinone(I; R1= Me, R2= OH)]. Other extractives include plumbagin, 7-methyljuglone, isodiospyrin, mamegakinone, bergenin, lupeol, betulin, betulinic acid, oleanolic acid, β-sitosterol, and stigmasterol. Diosindigo A has been synthesised by the oxidation of 4-methoxy-6-methylnaphthalene-1,8-diol, prepared from 7-methyljuglone.
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