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ortho-Cyclizations to C3r polycycles 1 and novel ring expansions by three ring members takes place on acid treatment of the 2,6-diisopropenylphenyl derivatives 2. The pentacoordinated o-chloranil adduct of 1 (Y = P) does not exhibit ideal turnstile geometry, but a distorted trigonal-bipyramidal structure.
Hellwinkel et al. (Fri,) studied this question.
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