Homonuclear spin decouplings of the non-first order 500 MHz 1H n.m.r. spectrum, proton shift-correlated 2D (COSY) n.m.r. experiments, and mess spectra suggest for the title compound the novel benz[e]azulene structure (1), or its enantiomer, formally derived by cyclization of a prenylated guaiane.
B. Demattè, A. Guerriero and F. Pietra, J. Chem. Soc., Chem. Commun., 1985, 391 DOI: 10.1039/C39850000391
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