Anonymous et al. published their research in Research Disclosure in 1990 | CAS: 2166-13-4

6-(4-Chlorophenyl)pyridazin-3(2H)-one (cas: 2166-13-4) belongs to pyridazine derivatives. Pyridazines is a six-membered nitrogen-containing significant heterocycle. It has received considerable interest because of its useful applications as natural products, pharmaceuticals, and various bioactive molecules. Pyridazine compounds have attracted interest in various fields like medicinal, industrial, and agricultural research as they are used for numerous biological activities and other applications.Reference of 2166-13-4

Production of 6-arylpyridazin-3-ones was written by Anonymous. And the article was included in Research Disclosure in 1990.Reference of 2166-13-4 This article mentions the following:

The cyclization of benzoylacrylic acid derivatives with NH3 and hydrazine derivatives gave phenylpyridazinone derivatives I (R = H, Me, F, Cl, Br, OMe; R1 = H, CH2OH, Ph, CH(OH)Ph, CH(OH)CH2OBu, CH2CO2H). In the experiment, the researchers used many compounds, for example, 6-(4-Chlorophenyl)pyridazin-3(2H)-one (cas: 2166-13-4Reference of 2166-13-4).

6-(4-Chlorophenyl)pyridazin-3(2H)-one (cas: 2166-13-4) belongs to pyridazine derivatives. Pyridazines is a six-membered nitrogen-containing significant heterocycle. It has received considerable interest because of its useful applications as natural products, pharmaceuticals, and various bioactive molecules. Pyridazine compounds have attracted interest in various fields like medicinal, industrial, and agricultural research as they are used for numerous biological activities and other applications.Reference of 2166-13-4

Referemce:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem