Add time:07/20/2019 Source:sciencedirect.com
Transition structures and energetics for the Cope rearrangements of cis-1,2-divinylcyclobutane, obtained by RHF/6-31G* and MP2(full)/6-31G*//RHF/6-31G* calculations, are reported. Three transition structures (endo-boatlike, chairlike and exo-boatlike) have been located, giving rise to formation of cis,cis-, cis,trans- and trans,trans-1,5-cyclooctadienes, respectively. cis-1,2-divinylcyclobutane rearranges via an endo-boatlike transition structure and yields the corresponding cis,cis product with higher exothermicity. Formation of severely strained cis,trans- and trans,trans-1,5-cyclooctadienes from this rearrangement is also discussed.
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