Stable dichromic carbo-cyclohexadiene chromophores are synthesised, selectively with respect to the corresponding carbo-benzenes, by fluorine “chemical locking”.
通过氟“化学锁定”,选择性地合成稳定的二色性碳-环己二烯色团,相对于相应的碳-苯。
Highly π electron-rich macro-aromatics: bis(p-aminophenyl)-carbo-benzenes and their DBA acyclic references
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.
X‐ray crystallography shows that all of the acyclic DBAs adopt a planar trans–transoid–trans configuration. The maximum UV/Vis absorption wavelength is found to vary consistently with the overall π‐conjugation extent and, more intriguingly, with the π‐donor character of the aryl X substituents, which varies consistently with the first (reversible) reduction potential and first (irreversible) oxidation