pyrrole

pyrrole
—pyrrolic /pi rol"ik, -roh"lik/, adj.
/pi rohl", pir"ohl/, n. Chem.
a colorless, toxic, liquid, five-membered ring compound, C4H5N, that is a component of chlorophyll, hemin, and many other important naturally occurring substances.
[1825-35; irreg. < Gk pyrr(hós) red + -OLE]

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      any of a class of organic compounds of the heterocyclic series characterized by a ring structure composed of four carbon atoms and one nitrogen atom. The simplest member of the pyrrole family is pyrrole itself, a compound with molecular formula C4H5N. The pyrrole ring system is present in the amino acids proline and hydroxyproline; and in coloured natural products, such as chlorophyll, heme (a part of hemoglobin), and the bile pigments. Pyrrole compounds also are found among the alkaloids, a large class of alkaline organic nitrogen compounds produced by plants.

      In heme and chlorophyll, four pyrrole rings are joined in a larger ring system known as porphyrin. The bile pigments are formed by decomposition of the porphyrin ring and contain a chain of four pyrrole rings.

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Universalium. 2010.

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  • pyrrole — [pir′ōl, pi rōl′] [Ger pyrrol < Gr pyrrhos, fiery (< pyr, FIRE) + ol, OLE] n. a colorless, pungent, slightly basic liquid, C4H5N, found in bile pigments, chlorophyll, and hematin, and obtained from coal tar, bone oil, etc …   English World dictionary

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  • pyrrole — pyrrol ou pyrrole [ pirɔl ] n. m. • 1875; mot all. (1835); du gr. purrhos « rouge, roux » et ol(e) ♦ Chim. Composé hétérocyclique azoté (C4H5N), dont on trouve le noyau dans la proline, les porphyrines et la chlorophylle, produit de la… …   Encyclopédie Universelle

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  • pyrrole — noun Etymology: Greek pyrrhos Date: 1835 a toxic liquid heterocyclic compound C4H5N that has a ring consisting of four carbon atoms and one nitrogen atom, polymerizes readily in air, and is the parent compound of many biologically important… …   New Collegiate Dictionary

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  • pyrrole — /ˈpɪroʊl/ (say pirohl), /pəˈroʊl/ (say puh rohl) noun a five membered ring system, C4H5N, containing four carbon atoms and a nitrogen atom. Chlorophyll, haemin, and many other important naturally occurring substances are built up of pyrrole rings …  

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