Diels-Alder with trans-trans E,E-diene

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The two CH3 groups appear beneath the new 6-membered ring, with the hydrogens above. There is a plane of symmetry throughout and the products must have this symmetry too, because the reaction is concerted and no significant movement of substituents can occur.

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J. Sauer, Angew. Chemie Int. Ed. English, 1967, 6, 16–33.