Aromaticity is an important concept in chemistry, which cannot be exactly defined, This simple fact has two consequences, (1) there are many "measures" of aromaticity and (2) some of them are ill-founded. The method recommended by Bao and Yu belongs to the second category. We shall stick to their terminology and notation. In order to estimate the extra stabilization energy (ESE) of an aromatic system, a choice of the reference structure should be made first. The authors consider the all-trans hexatriene as an illustrative case for their approach.
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