Singlet oxygenation of but-1-en-3-ynes: on the possible intermediacy of a 1,2-dioxacyclohexa-3,4-diene

Abstract

But-1-en-3ynes undergo singlet oxygenation resulting in the formation of products rationalizd as being derived from 1,2-dioxacyclohexa-3,4-dienes; ab intio calculations for such an intermediate are reports.