pyrazinen.
/ˈpʌɪrəziːn/, /ˈpɪrəziːn/, U.S. /ˈpɪrəˌzin/, /ˈpɪrəz(ə)n/ Chemistry.
A weakly basic, crystalline, heteroaromatic compound which is a diazine with the nitrogen atoms at opposite positions in the ring; any substituted derivative of this compound. Cf. pyridazine n., pyrimidine n.Systematic name: 1,4-diazabenzene, C4H4N2.
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the world > matter > chemistry > organic chemistry > organic compounds > [noun] > heterocyclic compounds > other heterocyclic compounds
alloxan1839
piperidine1854
valerin1866
acridine1870
piperidia1871
kairoline1883
quinoxaline1884
pyrimidine1885
pyrazolone1887
quinazoline1887
pyrazine1888
acridone1892
phthalazine1893
pyridazine1894
nitron1906
pyrrolizidine1939
1887 Jrnl. Chem. Soc. 52 i. 493 Xenylenedihydropyrazine.]
1888 Proc. Chem. Soc. 4 107 The author [sc. Mason] adopts Widman's nomenclature..: the ‘Ketines’.., ‘Pyrazines’.., ‘Aldines’.., and all compounds containing a ring of four carbon-atoms and two nitrogen-atoms in para-position are now termed Paradiazines, or Piazines.
1926 H. G. Rule tr. J. Schmidt Text-bk. Org. Chem. iii. viii. 699 Pyrazine itself is produced by the condensation of amino-acetaldehyde or amino-acetal. It..has an odour of heliotrope.
1970 Acta Crystallographica B. 26 979/1 Pyrazine..and Cu(NO3)2 form an anhydrous crystalline complex with a 1:1 pyrazine to Cu(NO3)2 ratio.
2001 P. Barham Sci. Cooking iii. 33 Pyrazines are the molecules that give fresh green notes to fruit and vegetables.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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