Tabebuin and tecomaquinone-III-dimeric quinones from Tabebuia rosea

Centre of Advanced Studies, Department of Chemistry, University of Rajasthan, Jaipur-302 004, Rajasthan, India E-mail : pahupsingh@yahoo.co.uk Manuscript received 1 August 2007, revised 30 November 2007, accepted 30 November 2007 Two dimeric C30 quinoncs-tabebuin and tecomaquinone-III have been isolated from the heartwood of Tabebuia rosea in addition to the previously reported 1,4-naphthoquinonc derivatives. Both the dimeric quinones are reported for the first time from this plant