from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A five-membered heterocyclic ring compound, C4H5N, having an odor similar to chloroform, that is the parent compound of protoporphyrin.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of a class of aromatic heterocyclic compounds containing a ring of four carbon atoms and a nitrogen atom; especially the simplest one, C4H5N.


Greek purros, red (from pūr, fire; see pyre) + -ole.
(American Heritage® Dictionary of the English Language, Fourth Edition)
pyrrhós, red (Wiktionary)


  • First reported in 1993 (ref. 2), it is part of a family of compounds known as pyrrole-imidazole alkaloids, which may help to deter fish from snacking on the sponge or prevent microbes from taking up residence.

    Scientific American

  • But I thought I used a simple SMILES when I typed C1CNCC1, but ChemSpider got it wrong : The correct structure should be pyrrolidine, not pyrrole.

    Archive 2009-08-01

  • The main reason for the latter investigation was the synthesis of these natural pyrrole pigments.

    Hans Fischer - Biography

  • Fischer received the greatest honour of all, the Nobel Prize for 1930, for his work on the chemistry of pyrrole and the synthesis of haemin.

    Hans Fischer - Biography

  • Fischer's scientific work was mostly concerned with the investigation of the constitutive properties of the pigments in blood, bile, and also leaves, as well as with the chemistry of pyrrole.

    Hans Fischer - Biography

  • It was discovered that the haemin molecule can be converted by certain chemical procedures into iron-free substances, called porphyrins, and that the porphyrins can be broken down, by other procedures, into pyrrole derivatives, i.e. into compounds containing four carbon atoms and one nitrogen atom in a closed ring.

    Nobel Prize in Chemistry 1930 - Presentation Speech

  • If we remember moreover that the pyrrole complexes determined by Fischer are contained as basic components partly in the principal catalysts of respiration, partly in an enzyme (catalase) which is indispensable to all living cells, it will be found that the intrinsic value of the researches on it is in full accord with the prize which will now be awarded.

    Nobel Prize in Chemistry 1930 - Presentation Speech

  • The aroma of coffee is, he found, composed of extremely complex substances, among which are derivatives of furan and pyrrole, and substances containing sulphur.

    Tadeus Reichstein - Biography

  • The leaf decomposition product, called Ma-FCC-61, is a pyrrole pigment with a previously unknown sugar unit attachment. - latest science and technology news stories

  • BODIPY core with heterocyclic rings even led to near infrared (NIR) emission; however, these dyes require lengthy multi-step syntheses of the fused-ring pyrrole starting materials and are restricted in scope to symmetrical frameworks. - latest science and technology news stories


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