Standard Article

Vinylcyclopropane Rearrangement

Published Online: 15 SEP 2010

DOI: 10.1002/9780470638859.conrr644

Comprehensive Organic Name Reactions and Reagents

Comprehensive Organic Name Reactions and Reagents

How to Cite

2010. Vinylcyclopropane Rearrangement. Comprehensive Organic Name Reactions and Reagents. 644:2880–2887.

Publication History

  1. Published Online: 15 SEP 2010

Chemistry Terms

Choose one or more boxes to highlight terms.

Abstract

This reaction is a thermal [1,3]-sigmatropic carbon shift of vinylcyclopropanes to cyclopentenes and is generally known as a vinylcyclopropane rearrangement, or vinylcyclopropane-cyclopentene rearrangement. The study finds that this rearrangement can undergo three types of reactions. The experimental evidence shows that the vinylcyclopropane rearrangement to cyclopentene is the dominating reaction because of the heat of formation of cyclopentene is lower than that of vinylcyclopropane, and the activation energy for the vinylcyclopropane rearrangement is lower than that of epimerization. In addition, an extra group on the cyclopropane ring can further lower the activation energy for the vinylcyclopropane rearrangement and an additional group on the vinyl moiety and at the cis-position will decrease the reaction rate. Furthermore, the silyl group enhances the reaction rate and stereoselectivity, owing to the hyperconjugation between the carbon-silyl bond and the vicinal cyclopropane ring orbital. This reaction has very broad application in organic synthesis.

Keywords:

  • cyclopentenes;
  • epimerization;
  • hyperconjugation;
  • vinylcyclopropanes