A solid obtained in the dimerisation of ageratochromene (6,7-dimethoxy-2,2-dimethyl-1-benzopyran)(II) in the presence of acid has been shown to be 5,6,6a,6b,7,12b-hexahydro-1,2,10,11-tetramethoxy-5,5,7,7-tetramethylcyclopenta[1,2-c;5,4,3-d′e′]bis[1]benzopyran (IV) by a study of its n.m.r. and mass spectra.
T. R. Kasturi, E. M. Abraham and P. Brown, J. Chem. Soc., Perkin Trans. 1, 1973, 2468 DOI: 10.1039/P19730002468
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