单词 | pyridazine |
释义 | pyridazinen. 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. ΘΚΠ 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 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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