... Department of Chemistry, University of Newcastle, NSW 2308. ... 1.r. (CHCI,): no v,,, for amino, azido or carbonyl groups. ... 2-Azidobenzaldehyde gave 2,l-benzisoxazole (33 %) at 117"; (2-azido-3,5-dibromopheny1)phenylmethanone gave 5,7-dibromo-3-phenyl-2,l-benzisox- azole ...