Substituted 1,3,3a,4,5,6a-hexahydro-oxazolo[4,5-d]-1,2,3-triazoles from a cycloaddition on a carbonyl group. Thermal ring expansion: a new route to substituted 1,3,4,5-oxatriazenes

Abstract

Substituted derivatives of hexahydro-oxazolo[4,5-d]-1,2,3-triazoles, a new ring system, are described, and the crystal structure of one derivative is reported; on being heated they undergo a ring expansion providing a simple new route to the rare 1,3,4,5-oxatriazine ring.