Equilibrium and Kinetic Deuterium Isotope Effects on the Hetero‐Diels–Alder Addition of Sulfur Dioxide

The CS bond is formed to a greater extent than the CO bond in the transition state of the [4+2] cycloaddition of SO2 to dimethylidenecyclohexane (see scheme). Both deuterium isotope effects and quantum calculations lead to this conclusion. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2003/z51732_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.