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Cyclic dienes are very reactive, for example cyclopentadiene in room temperature, it even dimerizes.

What is the factor that indicates such reactivity of cyclic dienes ?

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    $\begingroup$ They are fixed in the s-cis conformation, which is required for the Diels-Alder reaction. Whereas acyclic dienes can flip back and forth between the s-cis (reactive) and s-trans (unreactive) conformations $\endgroup$
    – orthocresol
    Jan 21 '16 at 8:49
  • $\begingroup$ chemistry.stackexchange.com/questions/5289/… $\endgroup$
    – Mithoron
    Jan 21 '16 at 12:33

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