Stable dichromic carbo-cyclohexadiene chromophores are synthesised, selectively with respect to the corresponding carbo-benzenes, by fluorine “chemical locking”.
A series of stable quadrupolar bis(p-aminophenyl)-carbo-benzenes, featuring both donorâdonorâdonor Ï-frustration and central macro-aromaticity, is described and compared to the acyclic dibutatrienylacetylene (DBA) reference series.