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pyridine

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

pyridine or azine , C 5 H 5 N, 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.

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Related newspaper, magazine, and trade journal articles from HighBeam Research

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Development trend of the pyridine market. (Special Report).
Magazine article from: China Chemical Reporter; 12/6/2002; ; 700+ words ; Pyridine and its derivatives include pyridine, 2-methyl pyridine, 3-methyl pyridine, 4-methyl pyridine and 2-methyl-5-pyridine. Pyridine compounds are first extracted from coal tar. With the demand increase in the economic growth and the development... Read more
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Related entries from encyclopedias, dictionaries, and thesauruses

pyridine nucleotides
Book article from: A Dictionary of Food and Nutrition pyridine nucleotides Obsolete name for the coenzymes NAD and NADP. Read more
py
Book article from: The Oxford Dictionary of Abbreviations py Chem. pyridine (used in formulae) Read more
azine
Book article from: The Columbia Encyclopedia, Sixth Edition , IUPAC name for pyridine . Read more
denatured alcohol
Book article from: A Dictionary of Food and Nutrition denatured alcohol The addition of dyestuffs and unpleasant flavours (such as pyridine) to prevent the consumption of alcohol which is intended for domestic or industrial purposes; up to 5% (toxic) methyl alcohol is added. Read more
ECAPO
Book article from: The Oxford Dictionary of Abbreviations ECAPO (ɪˈkɑːpəʊ) Chem. ethoxy carbonyl amino pyridine N-oxide Read more

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