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Reference.org
Electrophilic aromatic substitution
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<p>Electrophilic aromatic substitution (SEAr) is an <a href="/facts/Organic_reaction/SESmeGWm">organic reaction</a> in which an atom that is attached to an <a href="/facts/Aromatic_ring/wK0DzRY6">aromatic system</a> (usually hydrogen) is replaced by an <a href="/facts/Electrophile/1AHFg1zm">electrophile</a>. Some of the most important electrophilic aromatic substitutions are <a href="/facts/Aromatic_nitration/VnszL09H">aromatic nitration</a>, <a href="/facts/Aromatic_halogenation/yUWM46Ja">aromatic halogenation</a>, <a href="/facts/Aromatic_sulfonation/CLjgNq89">aromatic sulfonation</a>, alkylation <a href="/facts/Friedel%E2%80%93Crafts_reaction/N65aEdXA">Friedel–Crafts reaction</a> and acylation Friedel–Crafts reaction. </p>