Heinisch, Gottfried published the artcileSyntheses and reactions of pyridazine derivatives, VI. 1,2-Dipyridazinylethene- and -ethane-1,2-diols from pyridazine carboxaldehydes, Safety of Pyridazine-4-carbaldehyde, the publication is Monatshefte fuer Chemie (1976), 107(3), 799-808, database is CAplus.
Treatment of pyridazine-4-carboxaldehyde with catalytic amounts of KCN gave pyridazine-4-carboxylic acid and two stereoisomeric diols I, II. Pyridazine-3-carboxaldehyde reacts with HCN to give III. HCN-elimination from III yields the enediol IV which is oxidized to pyridazine-3-carboxylic acid or its methyl ester.
Monatshefte fuer Chemie published new progress about 50901-42-3. 50901-42-3 belongs to pyridazine, auxiliary class Pyridazine,Aldehyde, name is Pyridazine-4-carbaldehyde, and the molecular formula is C5H4N2O, Safety of Pyridazine-4-carbaldehyde.
Referemce:
https://en.wikipedia.org/wiki/Pyridazine,
Pyridazine | C4H4N2 – PubChem