Abstract [4+2] Cycloadditions of cyclopentadienes 1a–1i with arylsubstituted cyclic and open‐chain dienophiles usually gave single endo ‐cycloadducts in high yield. Assignment of the product structures involved 1 H‐NMR spectroscopy including ( 1 H, 1 H) long‐range coupling and ( 1 H, 19 F) through‐bond and through‐space coupling.
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Eibler et al. (1997) studied this question.
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