Thermolysis of 6-chloro- and 6-methoxy-3-azidopyridazine 2-oxide in inert solvents gives maleo-nitrile and cis-β-cyanoacrylate, respectively; 3-azido-pyridazine 2-oxide gives the unstable cyanoaldehyde and traces of 1-hydroxypyrazol-5-carbonitrile.
R. A. Abramovitch and I. Shinkai, J. Chem. Soc., Chem. Commun., 1975, 703 DOI: 10.1039/C39750000703
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