ChemInform Abstract: Synthetic Studies on O‐Heterocycles via Cycloadditions. Part 3. Regiochemical and Mechanistic Questions in Reactions of Polarized Diaryl Carbonyl Ylides.
Abstract Unsymmetrical diaryloxiranes such as (I) undergo smooth cycloaddition with electron‐deficient symmetrical olefins under thermal or photochemical conditions, apparently via polarized carbonyl ylide intermediates.