pyridazinen.

Brit.

/pɪˈrɪdəziːn/, U.S.

/pɪˈrɪdəˌzin/

Origin: A borrowing from German. Etymon: German Pyridazin.

Etymology: < German Pyridazin (F. Ach 1889, in Ann. der Chem. 253 46) < pyrid- (in Pyridin pyridine n.) + -azin (in Phenylhydrazin : see phenylhydrazine n. at phenyl n. Compounds 2), after -pyridazin- (in Phenyldimethylpyridazindicarbonsäureester: L. Knorr 1885, in Berichte der Deutsch. Chem. Ges. 18 304).

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).

单词	pyridazine
释义	pyridazinen. Brit. /pɪˈrɪdəziːn/, U.S. /pɪˈrɪdəˌzin/ Origin: A borrowing from German. Etymon: German Pyridazin. Etymology: < German Pyridazin (F. Ach 1889, in Ann. der Chem. 253 46) < pyrid- (in Pyridin pyridine n.) + -azin (in Phenylhydrazin : see phenylhydrazine n. at phenyl n. Compounds 2), after -pyridazin- (in Phenyldimethylpyridazindicarbonsäureester: L. Knorr 1885, in Berichte der Deutsch. Chem. Ges. 18 304). 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). < n.1894
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