Question

Why nitration of pyridine is difficult?

Answer 1

Answer:

Pyridine is bad at electrophilic aromatic substitution

The lower energy of the orbitals of pyri- dine's π system means that electrophilic attack on the ring is difficult. Another way to look at this is to see that the nitrogen atom destabilizes the cationic would-be intermediate, especially at the 2- and 4-positions.

Explanation:

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