Treatment of the epoxygermacrone (II) with 80% HCO2H, AlCl3, ButOK, or basic alumina afforded various cyclization products; in particular, (II) gave a cis-selinane sesquiterpene (IV) with 80% HCO2H.
M. Iguchi, M. Niwa and S. Yamamura, J. Chem. Soc., Chem. Commun., 1972, 689 DOI: 10.1039/C39720000689
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