Abstract
AbstractResonance energies of alternant conjugated hydrocarbons containing six‐membered and four‐membered rings are discussed via the semiempirical valence bond (VB) theory. After generating the higher‐order effective VB model according to cluster‐expansion theory, the aromaticity or antiaromaticity of the above compounds is quantified in a correct manner. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem, 2003
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