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Reduction of 1 with sodium or tert-butyllithium yields the diene dimer 3. The key intermediate, the strongly pyramidalized alkene 2, dimerizes to give a cyclobutane dimer, which then leads to 3. Compound 2 can also be trapped as a Diels-Alder adduct with 1,3-dienes.
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Camps et al. (1995) studied this question.
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