The activation parameters of the thermal rearrangements of the trans‐divinylcyclopropanes 1 and 2, and of cis‐divinylcyclopropane 3 to give cycloheptadiene 5 have been determined. In addition it has been shown that trans‐divinylcyclopropane‐cycloheptadiene rearrangements also occur under irradiation by a mercury lamp in benzene at 40°. These low‐temperature in vitro rearrangements suggest that the biosynthesis of the cycloheptadienes in Dictyopteris (dictyopterenes C′ and D′) may proceed by the same reaction(s).
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Pickenhagen et al. (1973) studied this question.
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