Pyridazine

Pyridazine
IUPAC name Pyridazine
Other names 1,2-diazine, orthodiazine, oizine
Identifiers
CAS number	289-80-5 Y
PubChem	9259
ChemSpider	8902 Y
ChEBI	CHEBI:30954 Y
ChEMBL	CHEMBL15719 Y
RTECS number	GY2390000
Jmol-3D images	Image 1
SMILES c1ccnnc1
InChI InChI=1S/C4H4N2/c1-2-4-6-5-3-1/h1-4H Y Key: PBMFSQRYOILNGV-UHFFFAOYSA-N Y InChI=1/C4H4N2/c1-2-4-6-5-3-1/h1-4H Key: PBMFSQRYOILNGV-UHFFFAOYAA
Properties
Molecular formula	C4H4N2
Molar mass	80.09 g mol−1
Appearance	colorless liquid
Density	1.107 g/cm3
Melting point	-8 °C, 265 K, 18 °F
Boiling point	208 °C, 481 K, 406 °F
Acidity (pKa)	2.10[1]
Related compounds
Related compounds	pyridine, pyrimidine, pyrazine
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Pyridazine is a heteroaromatic organic compound with the molecular formula C₄H₄N₂, sometimes called 1,2-diazine. It contains a six-membered ring with two adjacent nitrogen atoms. It is a colorless liquid with a boiling point of 208 °C.

Pyridazine has no household use. It is mainly used in research and industry as building block for more complex compounds. The pyridazine structure is found within a number of herbicides such as credazine, pyridafol and pyridate. It is also found within the structure of several pharmaceutical drugs such as cefozopran, cadralazine, minaprine, pipofezine, hydralazine, and cilazapril.

References

1. ^ Brown, H.C., et al., in Baude, E.A. and Nachod, F.C., Determination of Organic Structures by Physical Methods, Academic Press, New York, 1955.