Diazine

Not to be confused with Diazene.

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 Each contains a benzene ring in which two of the C-H fragments have been replaced by isolobal nitrogen. There are three isomers:

pyrazine (1,4-diazine)
pyrimidine (1,3-diazine)
pyridazine (1,2-diazine)

See also

6-membered rings with one nitrogen atom: pyridines
6-membered rings with three nitrogen atoms: triazines
6-membered rings with four nitrogen atoms: tetrazines
6-membered rings with five nitrogen atoms: pentazines
6-membered rings with six nitrogen atoms: hexazines

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