SEARCH Articles Figures Tables Aromatic Heterocycles Pyridine and Pyrrole Aromaticity, cycloheptatrienyl cation pyridine and Electrophilic Attack on N Aromatics Pyrrole and Pyridine Nucleophilic Attack on N Aromatics Pyrrole and Pyridine Pyridine and Pyrrole Two Aromatic Heterocycles Pyridine aromaticity