How is 3,5-Dichloropyridazine (CAS: 1837-55-4) typically synthesized?

3,5-Dichloropyridazine is typically synthesized through the electrochemical oxidation of 2,6-dichloropyridine. This process involves the use of a platinum electrode in a water-based electrolyte. Alternatively, it can be prepared by the reaction of 2,6-dichloropyridine with phosphorus oxychloride in the presence of a Lewis acid catalyst. The yields are usually around 85-90%, and the method is known for its good selectivity and ease of operation.