Stability of the Non‐IPR Isomers 6140 (D₃) and 6275 (D₃) of Fullerene C₆₈

The distribution of single, double and delocalized π‐bonds in molecules of non‐IPR isomers 6140 and 6275 of fullerene C68 has been shown for the first time. The reason of instability of both “empty” isomers has been shown to be presence of pentalene and phenalenyl‐radical substructures and local sterical strains in these molecules as well.