Abstract
Abstract A quantum chemical study of the electronic factors affecting the photochemical behaviour of 13-nor-E, E-isogermacrone, a sesquiterpene-type ketone, has been carried out. The results indicate that the parallel endo double bond intramolecular cyclization to cyclobutanes proceeding through n, π ∗ excited states is strongly favoured, the interaction between the crossed endo double bonds also being possible.
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