A hitherto unknown class of 14 (3)-, 30 (5)-, and 56-membered (4) azamacrocycles containing bispyrrolylphenylene moieties was synthesized via Mannich reactions and characterized by spectroscopic and crystallographic techniques. Among the observed 1 + 1 + 2, 2 + 2 + 4, 3 + 3 + 6, and 4 + 4 + 8 combinations of incorporated reactants in the crude product(s), three were isolated in pure forms. Acetate ions constrained in close proximity within the compartments of the di (5H22+)- and tetraprotonated (4H44+) macrocycles and one such complex existed in a dynamic equilibrium in solution.
Giri et al. (Thu,) studied this question.