On π-electron conjugation in the five-membered ring of fluoranthene-type benzenoid hydrocarbons

Abstract

A fluoranthene-type benzenoid hydrocarbon (FTBH) is a polycyclic conjugated system obtained by joining two ordinary benzenoid hydrocarbons so as to form a five-membered ring. The main differences between the ?-electron properties of FTBHs and those of ordinary benzenoid hydrocarbons are caused by this five-membered ring. The most important structural factors influencing the ?-electron conjugation in the five-membered ring of FTBHs were analyzed and established.