Aromaticity and Extrusion of Benzenoids Linked to [o -COSAN]−: Clar Has the Answer

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Benzene and pyrene can be synthetically linked to [o-COSAN]- keeping their aromaticity. At difference, naphthalene and anthracene are extruded in the same reaction. We have proven that extrusion is only favorable if the number of Clar's π-sextets remains constant. Thus, Clar has the answer to whether an attached polycyclic aromatic hydrocarbon to [o-COSAN]- is extruded or not ​
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