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Gibbs free energy profile and transition structures for the 8π–6π ring closure cascade of trisubstituted tetraenes 8 and 9. Structures and free energies (kcal mol–1) determined using the M06-2X/6-31+G(d,p) level of theory. Both a front view and a side view (Newman projection) of TS86πN and TS86πX are provided.
