How is 2,6-Dichloro-1,3-benzothiazole (CAS: 3622-23-9) typically synthesized?

2,6-Dichloro-1,3-benzothiazole is typically synthesized through the reaction of thiourea and chlorosulfonic acid. The process involves treating thiourea with chlorosulfonic acid, followed by hydrolysis. Commonly, the reaction is conducted at room temperature, and the yield is around 70-80%. Catalysts such as sulfuric acid are often used to enhance the reaction rate and selectivity.