Studies on medicinal and related plants of Sri Lanka. Part 18. Structure of a new naphthoquinone from Plumbago zeylanica

The isolation of chitranone (3), zeylanone (4), maritinone (5), 2-methylnaphthazarin (6), plumbazeylanone, and a new naphthoquinone, methylene-3,3′-diplumbagin (7) from the phenolic fraction of the light petroleum extract of the roots of Plumbago zeylanica(Plumbaginaceae) is reported. The dimethyl ether of the new quinone has been synthesized from plumbagin methyl ether.