<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>of halogenated 6‐aryl‐4, 5‐dihydropyridazinones using a catalytic system consisting of Cu(OAc)<sub>2</sub>/Na<sub>2</sub>CO<sub>3</sub>/pyridine with oxygen as the terminal oxidant</p> </abstract>