Diels-Alder with cis-cis Z,Z-diene

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The diene has two sets of substituents, inside and outside. The inside one is the bridging CH2 group and it has to end up on one side of the molecule, whilst the two hydrogens are outside and remain so.

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