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Gibbs free energy profile and transition structures for the 8π–6π ring closure cascade of tetraene 7. 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 along the forming bond also shown) of TS76πN and TS76πX are provided. Note the energies shown are relative to that of the most stable 1,8-dimethyl tetraene, 5.
