In heterogeneous catalysis, the catalyst is in a different phase from the reactants. Product Details of 1698-53-9, At least one of the reactants interacts with the solid surface in a physical process called adsorption in such a way. 1698-53-9, name is 4,5-Dichloro-2-phenylpyridazin-3(2H)-one. In an article，Which mentioned a new discovery about 1698-53-9
A convenient and versatile synthetic approach to substituted 1,3-oxazolo[4,5-d]pyridazinones is developed. The oxazole ring was formed upon reaction of 5-amino-4-hydroxy-3(2H)-pyridazinone with various carboxylic acid derivatives using a microwave-assisted procedure, which favors the reaction time and purity of the resulting products. The developed methodology is suitable for rapid, parallel, automated synthesis of oxazolopyridazinone libraries.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N3096 – PubChem