Synthesis and structure determination of pyrazine-containing macrocyclic polyazomethines

Two pyrazine-containing macrocyclic polyazomethines 2 and 3 were synthesized by direct [2 + 2] and [3 + 3] condensation reactions between 2,2′-[pyrazine-2,3-diylbis(oxy)]dibenzaldehyde (1) and hydrazine. Both 2 and 3 were characterized by NMR, HRMS, and their structures were determined via X-ray crystal diffraction studies.