请输入您要查询的英文单词:

 

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
随便看

 

英语词典包含1132095条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2022 Newdu.com All Rights Reserved
更新时间:2025/3/21 14:49:09