/pir"euh zohl', -zawl'/, n. Chem.
1. any of the group of heterocyclic compounds containing three carbon atoms, two adjacent nitrogen atoms, and two double bonds in the ring.
2. the parent compound, C3H4N2.
[1885-90; PYR- + AZOLE]

* * *

      any of a class of organic compounds of the heterocyclic series characterized by a ring structure composed of three carbon atoms and two nitrogen atoms in adjacent positions. The simplest member of the pyrazole family is pyrazole itself, a compound with molecular formula C3H4N2.

      The pyrazole compounds are not known to occur in nature; they are usually prepared by the reaction of hydrazines with 1,3-diketones. Many synthetic pyrazole compounds are of importance as dyes and medicinals. Among them are: antipyrine, used as an analgesic and febrifuge; tartrazine, most commonly used as a yellow dye for food; phenylbutazone (Butazolidin), an anti-inflammatory drug used in treatment of arthritis; and a series of dyes used as sensitizing agents in colour photography.

* * *

Universalium. 2010.

Look at other dictionaries:

  • Pyrazole —      Général …   Wikipédia en Français

  • pyrazole — ● pyrazole nom masculin Composé C3H4N2, dont le squelette se retrouve dans des médicaments et des colorants. Nom générique des dérivés de ce composé …   Encyclopédie Universelle

  • Pyrazole — Pyrazol Pyrazole sind eine Stoffgruppe heterocyclischer chemischer Verbindungen. Sie besitzen einen fünfgliedrigen Ring mit zwei benachbarten Stickstoffatomen und gehörten zu den Heteroaromaten, genauer zu den Azolen. Sie sind isomer zu den… …   Deutsch Wikipedia

  • Pyrazole — Chembox new ImageFileL1=Pyrazole numbering.png ImageSizeL1=100px ImageFileR1=Pyrazole3d.png ImageSizeR1=100px IUPACName=Pyrazole OtherNames=1,2 diazole Section1= Chembox Identifiers CASNo=288 13 1 PubChem= ChemSpiderID = 1019 SMILES=C1=CC=NN1… …   Wikipedia

  • pyrazole — pyr·azole pir ə .zōl n 1) a crystalline heterocyclic weakly basic compound C3H4N2 isomeric with imidazole 2) any of various derivatives of pyrazole …   Medical dictionary

  • pyrazole — pirazolas statusas T sritis chemija apibrėžtis Penkianaris heterociklinis junginys. formulė C₃H₄N₂ atitikmenys: angl. pyrazole rus. пиразол …   Chemijos terminų aiškinamasis žodynas

  • pyrazole — ˈpirəˌzōl, zȯl noun Etymology: International Scientific Vocabulary pyr + azole; originally formed as German pyrazol 1. : a crystalline feeble heterocyclic base C3H4N2 isomeric with imidazole obtained usually by action of acetylene on… …   Useful english dictionary

  • pyrazole — noun a) A heterocyclic organic compound containing two nitrogen atoms next to each others in a five membered ring, called 1,2 diazole in . b) A group of compounds containing that structure …   Wiktionary

  • pyrazole — pyr·azole …   English syllables

  • pyrazole — /ˈpɪrəzɒl/ (say piruhzol) noun 1. a colourless crystalline solid, C3H4N2, serving as the parent substance of important dyestuffs. 2. Chemistry any of a group of monocyclic organic compounds containing two adjacent nitrogen atoms in a five… …   Australian English dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.