10.2. Terminology: Electrophilic Aromatic Substitution (EAS) // SEAr
In place of adding two groups across the π bond, aromatic rings prefer to add one group and then become aromatic again. These types of reactions are called electrophilic aromatic substitutions because they substitute a hydrogen on an aromatic ring using an electrophile. They are typically abbreviated as SEAr (“substitution electrophilic aromatic”), though some sources use the acronym EAS.
