1698-53-9, Name is 4,5-Dichloro-2-phenylpyridazin-3(2H)-one, belongs to pyridazine compound, is a common compound. HPLC of Formula: C10H6Cl2N2OIn an article, once mentioned the new application about 1698-53-9.
Substituted 5-hydrazinopyridazin-3(2H)-ones, e.g., 4-chloro-2-(3-trifluoromethylphenyl)-5-(1-methylhydrazino)-pyridazin-3(2H)-one or 4-chloro-2-(2-fluoro-5-trifluoromethylphenyl)-5-(1-methylhydrazino)-pyridazin-3(2H)-one, are prepared by treating halogenated pyridazin-3-(2H)-ones with hydrazine and substituted hydrazines and are useful as central nervous system depressants and sleep inducers.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N3085 – PubChem