A-LevelChemistryIntroduction to organic chemistryMay/June 2022Paper 4 Q414 Marks
(d) The ligand bipyridine consists of two pyridine rings. Pyridine, C₅H₅N, and benzene, C₆H₆, have similar planar, cyclic structures. [Figure 4.2] (e) Pyridine reacts with Cl₂ in the presence of AlCl₃ as shown in Fig. 4.3. [Figure 4.3] The mechanism of this reaction is similar to that of the chlorination of benzene. AlCl₃ reacts with chlorine to generate an electrophile, Cl⁺. Complete the diagram to show the mechanism for the reaction of pyridine with Cl⁺. Include all relevant charges, dipoles, lone pairs of electrons and curly arrows as appropriate. [Diagram for reaction mechanism]
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