Pyridine is
a basic heterocyclic organic
compound with
the chemical
formula C5H5N. It is structurally related to benzene, with one methine group (=CH−) replaced
by a nitrogen atom. It is a highly flammable,
weakly alkaline, water-miscible liquid with a distinctive,
unpleasant fish-like smell. Pyridine is colorless, but older or impure samples
can appear yellow, due to the formation of extended, unsaturated polymeric
chains, which show significant electrical conductivity.[17] The pyridine ring occurs in many
important compounds, including agrochemicals, pharmaceuticals, and vitamins. Historically, pyridine was produced from coal
tar
APPLICATION
Pesticides
and pharmaceuticals
Laboratory
use
Reagents
