Everything about Pyridinium totally explained
Pyridinium refers to the
cationic form of
pyridine. This can either be due to
protonation of the ring nitrogen or because of addition of a substituent to the ring nitrogen, typically via
alkylation. The
lone pair of
electrons on the
nitrogen atom of pyridine isn't
delocalized, and thus pyridine can be protonated easily. Pyridine is often used as an organic base in chemical reations, thus the pyridinium
ion is produced as the counter ion to the leaving group in the reaction. This complex is often
insoluble in the organic solvent, so precipitation of the pyridinium leaving group complex is an indication of the progress of the reaction.
The pyridinium ion also plays a role in
Friedel-Crafts acylation. When pyridine is included, it forms a complex with the electrophillic
acylium ion, rendering it even more reactive.
Further Information
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