Nitrogen-Capped π-Prismands:  Syntheses and Conformational Analyses

The one-pot syntheses of the new diazabicyclophanes 5−7 are described. The benzene rings incorporated in the bridging chains exhibit rotational motion which is examined by means of variable-temperature NMR experiments and semiempirical calculations. X-ray analysis and NMR studies indicate that the metal ion in the endohedral silver(I) complex of 7 fluctuates between the two nitrogen atoms.