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Abstract
Benzalacetone 1 with an excess of chlorosulfonic acid did not give the expected 4, ω-disulfonyl dichloride 2, but 4,β-dichlorosulfonylstyrene 3, which was identified by microanalytical and spectral data, and characterised as the bis-N,N-dimethylsulfonamide 4 and the bis-acetone hydrazone 5. A mechanism for the conversion of 1 into 3 is proposed.