pyridine

pyridine (pĭrˈĭdēn) [key] or azine ăzˈēn, C5H5N, colorless, flammable, toxic liquid with a putrid odor. It melts at - 42°C and boils at 115.5°C. Chemically, it is a heterocyclic aromatic tertiary amine (see under amino group). Its molecule resembles that of benzene, one carbon-hydrogen unit in the benzene ring being replaced with a nitrogen molecule. It is miscible with water and with most organic solvents. Its aqueous solution is slightly alkaline. Pyridine is used as a solvent, as a denaturant for alcohol, and as a starting material in the synthesis of other compounds. Compounds that can be derived from pyridine include antihistamines and vitamins. Pyridine is obtained from bone oil or from coal tar by destructive distillation, which decomposes alkaloids that contain it. Alkaloids that contain pyridine include coniine, piperine (the alkaloid in pepper), and nicotine (present in tobacco); free pyridine is present in tobacco smoke.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on pyridine from Fact Monster:

  • azine - azine azine , IUPAC name for pyridine.
  • cyclic compound - cyclic compound cyclic compound, any one of a class of compounds whose molecules contain a number ...
  • Sir William Ramsay - Ramsay, Sir William Ramsay, Sir William, 1852–1916, Scottish chemist. He was professor of ...
  • acids and bases: Classification - Classification Acids and bases can be classified as organic or inorganic. Some of the more common ...
  • benzene - benzene benzene , colorless, flammable, toxic liquid with a pleasant aromatic odor. It boils at ...

See more Encyclopedia articles on: Organic Chemistry