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Reference.org
Electrophilic substitution
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<p>Electrophilic substitution reactions are <a href="/facts/Chemical_reaction/GpqWlKrz">chemical reactions</a> in which an <a href="/facts/Electrophile/1AHFg1zm">electrophile</a> displaces a <a href="/facts/Functional_group/GXkSPsjM">functional group</a> in a <a href="/facts/Organic_compound/gqCNaN45">compound</a>, which is typically, but not always, aromatic. Aromatic substitution reactions are characteristic of <a href="/facts/Aromatic/wK0DzRY6">aromatic</a> compounds and are common ways of introducing functional groups into <a href="/facts/Benzene/Fguue7nr">benzene</a> rings. Some <a href="/facts/Aliphatic_compound/9usN3neo">aliphatic</a> compounds can undergo electrophilic substitution as well. </p>