Heinisch, Gottfried published the artcilePyridazines. 7. Preparation of pyridazine-3-carboxaldehyde: synthesis and reactivity studies, Formula: C5H4N2O, the publication is Monatshefte fuer Chemie (1977), 108(1), 213-24, database is CAplus.
MnO2-oxidation of 3-pyridazinemethanol gave 3-pyridazinecarboxaldehyde (I). Properties of I and its reactions with NH compounds and methylpiridazines were studied. Reaction of I with 3-methylpiridazine gave mainly products of aldol addition II and III. Elimination of H2O from II gave the alkene IV. Isolation of dipyridazinylethane V as main product of reaction of I with 4-methylpiperazine however shows, that thermally induced dismutation cannot be excluded also on pyridazinyl-3-carbinols.
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, Formula: C5H4N2O.
Referemce:
https://en.wikipedia.org/wiki/Pyridazine,
Pyridazine | C4H4N2 – PubChem