摘要
In order to study the stability and estimate the resonance energy of benzenoid systems, many chemists agree that some kinds of Kekulé structures are more important than the others. Dewar and Longuet-Higgins, Clar, Randi, Randiand Klein gave different kinds of weights to Kekul structures of benzenoid hydrocarbon, respectively. Using their own concept, several approaches are proposed to calculate the resonance energy. In this note we propose an invafiant for benzenoid hydrocarbon, by which
基金
Project supported by the National Natural Sdence Foundation of China.
