88 DELOCALIZED CHEMICAL BONDING
A super ring molecule is formed by rolling a polyacene molecule into one ring with one edge benzene ring folding into the other. These are called cyclopolyacenes or cyclacenes.312 Although the zigzag cyclohexacenes (122) are highly aromatic (this example is a 22-electron system), the linear cyclohexacenes (e.g., the 24 elec- tron 123) are much less aromatic.313