pyridazinen.
/pɪˈrɪdəziːn/, U.S. /pɪˈrɪdəˌzin/ Chemistry.
A weakly basic, liquid, heteroaromatic compound which is a diazine with the nitrogen atoms at adjacent positions in the ring; any substituted derivative of this compound. Cf. pyrazine n., pyrimidine n.Systematic name: 1,2-diazabenzene, C4H4N2.
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alloxan1839
piperidine1854
valerin1866
acridine1870
piperidia1871
kairoline1883
quinoxaline1884
pyrimidine1885
pyrazolone1887
quinazoline1887
pyrazine1888
acridone1892
phthalazine1893
pyridazine1894
nitron1906
pyrrolizidine1939
1894 H. F. Morley & M. M. P. Muir Watts' Dict. Chem. (rev. ed.) IV. 350/2 Pyridazine. The ring [formula].
1926 H. G. Rule tr. J. Schmidt Text-bk. Org. Chem. viii. i. 697 Pyridazines can often be prepared by the oxidation of their dihydro-derivatives.
1975 R. F. Brown Org. Chem. xxviii. 902 The three isomeric diazines are 1,2-diazabenzene (pyridazine), 1,3-diazabenzene (pyrimidine), and 1,4-diazabenzene (pyrazine).
1998 Interzone July 18/1 Soon..a billion nanomachines were swarming and polymerizing surplus atoms into carbon-chains with pyridazine rings as switches.
This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).
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