pyridazine Chem.
(pɪˈrɪdəziːn)
[f. pyro- + -id4 + azine.]
The weakly basic colourless liquid C4H4N, 1,2-diazine; also, any derivative of this.
| 1895 Jrnl. Chem. Soc. LXVIII. 301 When it is heated..with 5 per cent. hydrochloric acid at 200°, it yields pyridazine. 1926 H. G. Rule tr. Schmidt's 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). |