Compound 2 was prepared by a salt elimination reaction of lithiated 2,
6-diisopropylaniline with BiCl3 in 3:1 molar ratio. Single-crystal X-r
ay structure analysis reveals a planar amino-substituted Bi-N ring rep
resenting the first example of this type of Bi-N system. Compound 2 co
mpletes the intensively investigated field of cyclic group 15 amides s
uch as cyclophosphazanes, -arsazanes, and -stibazanes.