The above-mentioned compounds have neither the σ electron framework of a regular aromatic system nor the arrangement of parallel pπ atomic orbitals. Their molecules are cyclic π systems separated by one or two saturated carbon atoms, but their geometry allows p orbitals. Effective overlap beyond the isolation gap, and the number of π electrons conforms to the 4 n + 2 rule, resulting in aromaticity, which is called "homoaromaticity".
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