How is 1,1'-Sulfonylbis[3,5-dibromo-4-(2,3-dibromopropoxy)benzene] (CAS: 42757-55-1) typically synthesized?

1,1'-Sulfonylbis[3,5-dibromo-4-(2,3-dibromopropoxy)benzene] is synthesized through a multi-step process involving bromination reactions and a coupling reaction. Key reagents include 2,3-dibromopropanol and 3,5-dibromobenzenesulfonyl chloride. The process typically requires the use of a catalyst, such as triphenylphosphine, and is carried out under anhydrous conditions to prevent side reactions. Yields are generally in the range of 60-70%.