Addition of Olefins to 2,5‐Diphenyl‐1,3,4‐oxadiazin‐6‐one

Abstract

Cycloadditions of the oxadiazinones (1) with benzvalene, norbornene, norbor-nadiene, cyclopentene, and styrene yield primary products of the formal addition of benzoyl- and a phenylketenyl-group to the double bond, which then react further–in the case of benzvalene to the tetracycle (2).