alexa State of the Art of the Bonding Changes along the Diels-Alder Reaction between Butadiene and Ethylene: Refuting the Pericyclic Mechanism

OMICS International organises 3000+ Global Conferenceseries Events every year across USA, Europe & Asia with support from 1000 more scientific societies and Publishes 700+ Open Access Journals which contains over 50000 eminent personalities, reputed scientists as editorial board members.

State of the Art of the Bonding Changes along the Diels-Alder Reaction between Butadiene and Ethylene: Refuting the Pericyclic Mechanism

Bonding changes along the Diels-Alder reaction between butadiene 1 and ethylene 2 and related non-polar Diels- Alder reactions have been analysed using the Bonding Evolution Theory (BET). The Electron Localization Function (ELF) analysis of these synchronous single bond-formation processes indicates that C-C bond formation takes place by the C-to-C coupling of two pseudoradical centers formed along the reaction. The present study permits the establishment of two significant findings: i) the breaking of the C=C double bonds in butadiene 1 and ethylene 2 and the formation of the new C-C single bonds in cycloadduct are non-concerted due to the changed in electron density required for the formation of the pseudoradical centers, and ii) the symmetric changes in electron density along these cycloadditions do not have a cyclic movement. These behaviours, which are opposite to the “concerted and close curve bonding changes” proposed by R. B. Woodward and R. Hoffmann for pericyclic reactions, allow refuting this mechanism for Diels-Alder reactions.

 

Citation: Domingo LR (2013) State of the Art of the Bonding Changes along the Diels-Alder Reaction between Butadiene and Ethylene: Refuting the Pericyclic Mechanism. Organic Chem Curr Res 2:120. doi: 10.4172/2161-0401.1000120

  • Share this page
  • Facebook
  • Twitter
  • LinkedIn
  • Google+
  • Pinterest
  • Blogger