It is strong evidence for Hu ¨ckel’s rule that 86 and 87 are not aromatic while the cyclopropenyl cation (80) and the cyclopentadienyl anion (58) are, since simple resonance theory predicts no difference between 86 and 80 or 87 and 58 (the same number of equivalent canonical forms can be drawn for 86 as for 80 and for 87 as for 58).