Entry point into new trimeric and tetrameric imide-based macrocyclic esters derived from isophthaloyl dichloride and methyl 6-aminonicotinate

Figure 1
Views of (a) the imide hinge CO

CO torsional twist angle; (b) the syn- and anti-conformations of the isophthaloyl groups; (c) the isophthaloyl OC

CO torsion angle and (d) the cisoid and transoid orientations of the meta-related isophthaloyl C=O groups.