Partitioning of π-Electrons in Rings of Polycyclic Conjugated Hydrocarbons. 5. Nonalternant Compounds

All possible nonalternant hydrocarbons with a total of two, three, or four 5-, 6-, and 7-membered rings have been examined for the partition of their π-electrons by averaging over all Kekulé structures (considered to contribute equally to the electron distribution) the π-electrons in each ring in accordance to the rules introduced earlier: for each double bond shared with another ring one π-electron is taken into account, and for double bonds that are not shared two π-electrons are added. The trends observed for the partitions are discussed, and a comprehensive bibliography is provided as Supporting Information for all such systems, including both experimental and theoretical published data.