"' Pyridazine "'is a heterocyclic organic compound with the molecular formula ( CH ) 4 N 2.
2.
Replacement of a second CH bond with N gives, depending on the location of the second N, pyridazine, pyrimidine, and pyrazine.
3.
The other diazines are pyrazine ( nitrogen atoms at the 1 and 4 positions ) and pyridazine ( nitrogen atoms at the 1 and 2 positions ).
4.
It reacts with norbornadiene in a sequence of one DA reaction and two retro-DA reactions to cyclopentadiene and a pyridazine with exchange of an acetylene unit:
5.
Substitution of one C H in pyridine with a second N gives rise to the diazine heterocycles ( C 4 H 4 N 2 ), with the names pyridazine, pyrimidine, and pyrazine.
6.
The two last members of this series, hexazine and pentazine, have not been observed, although all other members of the azine series have ( such as pyridine, pyrimidine, pyridazine, pyrazine, triazines, and tetrazines ).
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