pyrrole ring
A heterocyclic ring structure, found in many important biological pigments and structures that involve an activated metal ion, eg. chlorphyll, haem.

Dictionary of molecular biology. 2004.

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  • 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 …   Universalium

  • Pyrrole — Chembox new Name = Pyrrole ImageFile = Pyrrole.png ImageSize = 300px ImageName = Chemical structure of pyrrole IUPACName = Pyrrole Pyrrol Section1 = Chembox Identifiers CASNo = 109 97 7 SMILES = C1=CC=CN1 InChI=1/C4H5N/c1 2 4 5 3 1/h1 5H Section2 …   Wikipedia

  • 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

  • pyrrole — Divinylenimine; a heterocyclic compound found in many biologically important substances. SYN: azole, imidole. * * * pyr·role pi(ə)r .ōl n a toxic liquid heterocyclic compound C4H5N that has a ring consisting of four carbon atoms and one nitrogen… …   Medical dictionary

  • 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 …   Australian English dictionary

  • pyrrole — noun Any of a class of aromatic heterocyclic compounds containing a ring of four carbon atoms and a nitrogen atom; especially the simplest one, CHN. Syn: azole …   Wiktionary

  • pyrrole — pyr•role [[t]pɪˈroʊl, ˈpɪr oʊl[/t]] n. chem. a colorless, toxic, liquid, five membered ring compound, C4H5N, that is a component of chlorophyll and hemin • Etymology: 1825–35; < Gk pyrr(hós) red pyr•rol•ic pɪˈrɒl ɪk, ˈroʊ lɪk adj …   From formal English to slang

  • Simple aromatic ring — Simple aromatic rings, also known as simple arenes or simple aromatics, are aromatic organic compounds that consist only of a conjugated planar ring system with delocalized pi electron clouds. Many simple aromatic rings have trivial names. They… …   Wikipedia

  • Aromatic ring current — This article is about aromatic chemistry. For the meteorological effect, see Ring current. A diagram of an aromatic ring current. B0 is the applied magnetic field, the red arrow indicating its direction. The orange ring shows the direction of the …   Wikipedia

  • Basic aromatic ring — Basic aromatic rings are aromatic rings in which the lone pair of electrons of a ring nitrogen atom is not part of the aromatic system and extends in the plane of the ring. This lone pair is responsible for the basicity of these nitrogenous bases …   Wikipedia

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