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Proposed mechanism of (+)-δ-cadinene synthase proceeds through an initial ionization–recombination–reionization sequence yielding a cisoid allylic cation, which then undergoes a C1–C10 cyclization reaction to yield the helminthogermacradienyl cation. A 1,3-hydride transfer and proton elimination then yield (+)-δ-cadinene. Reproduced from ref (342). Copyright 2009 American Chemical Society.
