How is 4-Pyridazinecarbaldehyde (CAS: 50901-42-3) typically synthesized?

4-Pyridazinecarbaldehyde (CAS: 50901-42-3) can be synthesized through the condensation of pyridazine with formaldehyde in the presence of an acid catalyst such as sulfuric acid or hydrochloric acid. The reaction typically yields a mixture containing 4-pyridazinecarbaldehyde along with other isomers. The yield and selectivity can be improved by using specific solvents and reaction conditions.