Because of its wide applicability, particularly to aromatic systems, electrophilic substitution is an important reaction.
In aromatic systems the reverse situation, in which elimination occurs, followed by addition, also is found.
Resonance fluorescence is generally observed for monatomic gases and for many organic molecules, in particular aromatic systems that absorb in the visible and near-ultraviolet regions.
Several examples of forming strained aromatic systems is also presented.
To apply this rule it is necessary to first identify aromatic systems.
Both atoms and bonds were further characterized by their participation in aromatic systems.
Erroneously the ontology class "cycloarenes" was considered as simply cyclic aromatic systems in our initial ontology.
This indicates that today a higher fraction of known structures contain aromatic systems.
This new route makes it possible to polymerise monomers which possess enlarged aromatic systems.
The superposition of the fragments yields minimal distances of the mapped atoms, because of the planarity of aromatic systems.
The 2SHA method identifies the aromatic systems and maps the corresponding systems onto each other in the first assignment step.
