"' 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.
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The other diazines are pyrazine ( nitrogen atoms at the 1 and 4 positions ) and pyridazine ( nitrogen atoms at the 1 and 2 positions ).
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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:
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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.
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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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