pyridine


pyridine
pyridic /puy rid"ik/, adj.
/pir"i deen', -din/, n. Chem.
a colorless, flammable, liquid organic base, C5H5N, having a disagreeable odor, usually obtained from coal or synthesized from acetaldehyde and ammonia: used chiefly as a solvent and in organic synthesis.
[1850-55; PYR- + -ID3 + -INE2]

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Any of a class of aromatic compounds with a six-member aromatic ring composed of five carbon atoms and one nitrogen atom, making it a heterocyclic compound.

The simplest one is pyridine itself (C5H5N). Natural compounds with pyridine rings include niacin and pyridoxine (see vitamin B complex), the tuberculosis drug isoniazid, and several plant products (e.g., nicotine). Pyridine is used as a raw material for various drugs, vitamins, and fungicides and as a solvent. Because it has a nauseating odour and a burning taste, it is added to ethanol and antifreezes to make them undrinkable (see denaturation).

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      any of a class of organic compounds of the aromatic heterocyclic series characterized by a six-membered ring structure composed of five carbon atoms and one nitrogen atom. The simplest member of the pyridine family is pyridine itself, a compound with molecular formula C5H5N.

      Pyridine is used as a solvent and is added to ethyl alcohol to make it unfit for drinking. It is converted to such products as sulfapyridine, a drug active against bacterial and viral infections; pyribenzamine and pyrilamine, used as antihistaminic drugs; piperidine, used in rubber processing and as a chemical raw material; and water repellents, bactericides, and herbicides. Compounds not made from pyridine but containing its ring structure include niacin and pyridoxal, both B vitamins; isoniazid, an antitubercular drug; and nicotine and several other nitrogenous plant products.

      Pyridine occurs in coal tar, its principal source before development of a synthesis based on acetaldehyde and ammonia. The pure substance is a colourless, flammable, weakly alkaline, water-soluble liquid with an unpleasant odour; it boils at 115.5° C (234° F).

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Universalium. 2010.

Look at other dictionaries:

  • Pyridine — Pyridine …   Wikipedia

  • Pyridine — Structures de la pyridine Général Nom IUPAC Azine …   Wikipédia en Français

  • PYRIDINE — Formule brute: C5H5 Masse moléculaire: 79,00 g Point de solidification: 42 0C Point d’ébullition: 115,5 0C Densité (à 0 0C): 1,003 Liquide incolore d’odeur pénétrante caractéristique et désagréable, inflammable. Ce composé hétérocycle aromatique… …   Encyclopédie Universelle

  • Pyridine — Pyr i*dine, n. [From Gr. ? fire.] (Physiol. Chem.) A nitrogenous base, {C5H5N}, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colorless liquid with a peculiar pungent odor. It is the… …   The Collaborative International Dictionary of English

  • pyridine — [pir′ə dēn΄, pir′ədin] n. [ PYR + ID + INE3] a flammable, colorless or pale yellow liquid base, C5H5N, having a sharp, penetrating odor: it is produced in the distillation of coal tar or bone oil and is used in the synthesis of vitamins and drugs …   English World dictionary

  • pyridine — piridinas statusas T sritis chemija apibrėžtis Heterociklinis junginys. formulė (CH)₅:N santrumpa( os) Py atitikmenys: angl. pyridine rus. пиридин …   Chemijos terminų aiškinamasis žodynas

  • pyridine — noun Etymology: pyr + ide + 2 ine Date: 1851 a toxic water soluble flammable liquid base C5H5N of pungent odor that is the parent of many naturally occurring organic compounds and is used as a solvent and as a denaturant for alcohol and in the… …   New Collegiate Dictionary

  • pyridine — noun Any of a class of aromatic heterocyclic compounds containing a ring of five carbon atoms and an nitrogen atom; especially the simplest one, CHN …   Wiktionary

  • pyridine — C5H5N; a colorless volatile liquid of empyreumatic odor and burning taste, resulting from the dry distillation of organic matter containing nitrogen; used as an industrial solvent, in analytic chemistry, and for denaturing alcohol …   Medical dictionary

  • pyridine — (pi ri di n ) s. f. Alcali huileux contenu dans les produits de la distillation sèche des os …   Dictionnaire de la Langue Française d'Émile Littré


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