Pyridazine
Encyclopedia
Pyridazine is a heteroaromatic organic compound
Organic compound
An organic compound is any member of a large class of gaseous, liquid, or solid chemical compounds whose molecules contain carbon. For historical reasons discussed below, a few types of carbon-containing compounds such as carbides, carbonates, simple oxides of carbon, and cyanides, as well as the...

 with the molecular formula C4H4N2, sometimes called 1,2-diazine
Diazine
Diazine refers to a group of organic compounds having the molecular formula C4H4N2. Each contains a benzene ring in which two of the C-H fragments have been replaced by isolobal nitrogen...

. 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
Cefozopran
Cefozopran is a fourth-generation cephalosporin....

, cadralazine
Cadralazine
Cadralazine is an antihypertensive of the hydrazine chemical class.- References :...

, minaprine
Minaprine
Minaprine is an antidepressant used in France for the treatment of depression. It acts as a reversible inhibitor of MAO-A . It has also been found to inhibit acetylcholinesterase.- References :...

, pipofezine
Pipofezine
Pipofezine is a tricyclic antidepressant approved in Russia for the treatment of depression. It was introduced in the late 1960s and is still used today....

, hydralazine
Hydralazine
Hydralazine is a direct-acting smooth muscle relaxant used to treat hypertension by acting as a vasodilator primarily in arteries and arterioles...

, and cilazapril
Cilazapril
Cilazapril is a pyridazine angiotensin-converting enzyme inhibitor used for the treatment of hypertension and congestive heart failure. It is branded as Inhibace in Canada, Zapril in New Zealand, Vascace and Dynorm in Europe...

.
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