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Isopagodanes like the “square”, D2d-symmetric C20H20 [1.1.1.1] skeleton 1 may serve as precursors to unusual cage ions of very special geometry. The synthetic strategy for pagodanes could not be directly applied to isopagodanes. A detour, in which a [2 + 2] photocycloaddition replaced the unsuccessful [6 + 6] photocycloaddition, was ultimately successful.
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Wollenweber et al. (1994) studied this question.
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