Chemistry is traditionally divided into organic and inorganic chemistry. Quality Control of 4,5-Dichloro-2-phenylpyridazin-3(2H)-one, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 1698-53-9
The reaction of 2-substituted-4,5-dichloro-3(2H)-pyridazinones 1a-b with alkoxides and alkylthiolates was investigated.Regiospecific displacement of either the 4 or 5 chlorine atom could be achieved in most cases by appropriate selection of the reaction solvent.
If you are interested in 1698-53-9, you can contact me at any time and look forward to more communication. Quality Control of 4,5-Dichloro-2-phenylpyridazin-3(2H)-one
Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N3104 – PubChem