The inside and outside protonation of a 15-membered O2N2-macrocycle. Synthesis and structural characterization of the protonated ligand salts

The synthesis, isolation and structural characterization of the novel protonated macrocyclic salts of dioxa-diaza macrocycle 5,6,14,15-dibenzo-1,4-dioxa-8,12-diazacyclopentadeca-5,14-diene are described.