4:7,10:13-Diepoxy-1-aza[16]annulene and 3:6,9:12,15:18-triepoxy-2-chloro-1-aza-[18]annulene as the first examples of oxygen-bridged aza-[4n]- and -[4n+ 2]annulenes

Abstract

The annulenone oximes (III) and (VIIIb) undergo the Beckmann rearrangement to yield the compounds (V), (VI) and (IX) mentioned in the title.