Reagent Design and Study of p-Benzoquinone Derivatives as Highly Reactive Electron-Attracting Dienophiles. A Promising Class of Reagents (Synthons) for Cycloaddition

Article abstract of DOI:10.1021/ja00407a043

p-Benzoquinone-2,3-dicarboxylic anhydride (4) and N-phenylimide (5) were prepared by oxidation of the corresponding hydroquinones.Compounds 4 and 5 are found to have high reactivities toward electron-rich dienes and trienes such as norbornadiene, 6,6-dime