<i>o</i>-Fluoranil: Stereochemistry and Mechanism of Its Diels−Alder Reactions
作者:David M. Lemal、Dayong Sang、Sudharsanam Ramanathan
DOI:10.1021/jo9015562
日期:2009.10.16
In the absence of significant steric effects, Diels−Alder reactions of the title quinone generally take place with preservation of configuration, and are therefore probably concerted. However, hybrid density functional calculations indicate that often these reactions are highly asynchronous. Steric hindrance can result in reaction at quinone oxygen instead of carbon. Preference for endo over exo cycloaddition