My two previous explorations of aromatic substitutions have involved an electrophile (NO ⁺ or Li ⁺ ). Time now to look at a nucleophile, representing nucleophilic aromatic substitution . The mechanism of this is thought to pass through an intermediate analogous to the Wheland for an electrophile, this time known as the Meisenheimer complex[cite]10.1002/jlac.19023230205[/cite]. I ask the same question as before;