any of a class of organic compounds of the heterocyclic series characterized by a ring structure containing four atoms of carbon and two of nitrogen. The pyrazine ring is part of many polycyclic compounds of biological or industrial significance. The simplest member of the pyrazine family is pyrazine itself, a colourless, water-soluble solid with molecular formula C4H4N2. Pyrazine is seldom prepared. Its hexahydro derivative, piperazine, was first made in 1888; several of its derivatives find use as chemical raw materials.

      Other members of the pyrazine family are pteridines, alloxazines, and phenazines. Certain pigments, first isolated from butterfly wings in 1891, are pteridines, as are the folic acids (folic acid), which participate in a variety of essential chemical reactions in the body. Riboflavin (vitamin B2), a growth-promoting factor, is an alloxazine compound. Among the large group of phenazine dyes, the best known are Perkin's mauve (the first commercial synthetic dye, discovered in 1856); aniline black; and indanthrene (or indanthrone), the first of the anthraquinone vat dyes.

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Universalium. 2010.

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  • pyrazine — pyr·azine pir ə .zēn n 1) a crystalline heterocyclic weakly basic compound C4H4N2 2) any of various derivatives of pyrazine * * * py·ra·zine (pĭґrə zēn) an aromatic compound comprising a six membered ring with nitrogen atoms at… …   Medical dictionary

  • pyrazine — pirazinas statusas T sritis chemija apibrėžtis Šešianaris heterociklinis junginys. formulė C₄H₄N₂ atitikmenys: angl. pyrazine rus. пиразин ryšiai: sinonimas – 1,4 diazinas …   Chemijos terminų aiškinamasis žodynas

  • pyrazine — noun A diazine in which the two nitrogen atoms are in the para positions; many of its derivatives are pharmaceuticals …   Wiktionary

  • pyrazine — pyr·azine …   English syllables

  • pyrazine — ˈpirəˌzēn, zə̇n noun Etymology: International Scientific Vocabulary pyr + azine : a crystalline feeble heterocyclic base C4H4N2 obtained usually by distilling piperazine with zinc dust called also paradiazine …   Useful english dictionary

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