Lead(IV) acetate was found to be a suitable dehydrogenating agent for the preparation of 6H-benzofuro[3,2-c]benzopyran from its 6a,11a-dihydro-derivative. The product was also synthesised independently. A scheme for the chemical interconversion of the 6H-benzofuro[3,2-c]benzopyrans and the related isoflavonoids is suggested.
P. J. M. Gunning, P. J. Kavanagh, M. J. Meegan and D. M. X. Donnelly, J. Chem. Soc., Perkin Trans. 1, 1977, 691 DOI: 10.1039/P19770000691
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