C2v symmetric structure (a first-order saddle point). However, the DTT bridge is too long by ~0.9 Å to fit into an [34]octaphyrin (see Figure ), and its incorporation leads to the strongly puckered compound. Indeed, a planar C2v symmetric structure of 2 is a higher-order saddle point 87.0 kcal/mol above the minimum. The importance of the nonplanarity for the observations made by Kim and co-workers becomes obvious through an ACID plot of the planar C2v structure because now the two 26π-electron ring currents are of similar weights and cancel on the bridge whereas the current through the perimeter remains (Figure ). In the planar structure of 2 there is a slight reduction in the difference in the extent of delocalization between the two 26-electron cycles (34 vs. 39%) (Table ). Hence, it is the non-equivalence of the two 26-electron resonance structures of 2 and 3, effectuated through the non-planar structures and the larger C-C-C-C dihedrals within one macrocyclic path than within other, that leads to the observation of two strong ring currents with, respectively, 34 and 26 -electrons and one with weakened strength (Figure ). It is apparent that these macrocycles resemble distorted naphthalene.