Abstract Benzophenone (1), diphenyl sulfone, and 4-nitro-2′-chloro-and 4-nitro-2′, 6′- dichloro-diphenyl ethers (23, 24) have been chlorosulfonated. The direct yield of benzophenone-3, 3′-disulfonyl chloride (2) was low, the majority of product was the disulfonic acid. Diphenyl sulfone (11) with a large amount of chlorosulfonic acid (8 mols) at 140° gave the 3, 3′-disulfonyl chloride (12). With less reagent (6 mols) at 90° a mixture of ...
