Transition structures and energetics for the Cope rearrangement of cis-1,2-divinylcyclopropane: an ab initio study


Zora M. , Ozkan I. , Danisman M.

JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM, vol.636, pp.9-13, 2003 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 636
  • Publication Date: 2003
  • Doi Number: 10.1016/s0166-1280(03)00478-0
  • Title of Journal : JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM
  • Page Numbers: pp.9-13

Abstract

Transition structures and energetics for the Cope rearrangements of cis-1,2-divinylcyclopropane, 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-1,4-cycloheptadienes, respectively. cis- 1,2-Divinylcyclopropane 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- 1,4-cycloheptadienes from this rearrangement is also discussed. (C) 2003 Elsevier B.V. All rights reserved.