Journal of the Chemical Society. Perkin transactions I p. 1755 - 1759 (1984)
Update date:2022-08-16
Topics:
Dean, Francis M.
Khan, Hafizzullah
Minhaj, Najme
Prakash, Satya
Zaman, Asif
From the heartwood of Calophyllum wightianum T.Anders has been isolated, in small quantities, a clathrate composed of four molecules of a pigment, wightianone, to one of palmitic acid.Other fatty acids are present in small amounts.Wightianone is shown to be identical with zeyloxanthonone and to have the structure (1) <7,9-dihydroxy-4,4,8-tris(3-methylbut-2-enyl)-1,2-dihydroxanthene-3-dione>.The isomeric structure (2) for the pigment was rejected on the basis of the aromatic solvent-induced shifts and because of biosynthetic considerations, i.e., the occurrence of gem-dialkylation in resorcinol and phloroglucinol but not in quinol nuclei.
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