How is 3,6-Dichloro-4-methylpyridazine (CAS: 19064-64-3) typically synthesized?

3,6-Dichloro-4-methylpyridazine can be synthesized via the reaction of 4-methylpyridine with chlorine in the presence of a Lewis acid catalyst, such as aluminum chloride. The reaction is selective and provides good yield under mild conditions. The process involves electrophilic aromatic substitution and results in the introduction of chloro substituents at the 3 and 6 positions.