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N-(2,2,2-Trichloroethylidene)-5-chlorothien-2-ylsulfonamide, the first representative of the polyhaloalkylidenamides of heterylsulfonic acids, has been synthesized by the reaction of N,Ndichloro-5-chlorothien-2-ylsulfonamide with trichloroethylene and used as a regioselective Сamidoalkylating agent of aromatic compounds and in reactions with nucleophiles, forming a series of N-(2,2,2-trichloroethyl) amides of 5-chloro-2-thienylsulfonic acid.

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The reaction of the N,N-dichloroamide of 5-chloro-2-thienylsulfonic acid with trichloroethylene as a convenient synthetic route to a series of trichloroethylamides of 5-chloro-2-thienylsulfonic acid