Structure (1)(4β,4aβ,7β,7aβ-tetramethyl-4,4a,6,7,7a,8-hexahydrocyclopenta[f]benzofuran-5-one) is definitively assigned to pinguisone on the basis of its mass and 13C n.m.r. spectra; X-ray analysis of its p-bromobenzylidene derivative (4) establishes the absolute stereochemistry of the compound. The simultaneous formation of both (Z)- and (E)-p-bromobenzylidene derivatives (3) and (4) from (1) is discussed.
A. Corbella, P. Gariboldi, G. Jommi, F. Orsini, A. DeMarco and A. Immirzi, J. Chem. Soc., Perkin Trans. 1, 1974, 1875 DOI: 10.1039/P19740001875
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