Electrochemical synthesis of sulfonamides from arenesulfonohydrazides or sodium p-methylbenzenesulfinate and amines

An efficient electrochemical synthesis of sulfonamides (yields 56–98%) from arenesulfonohydrazides or sodium p-methylbenzenesulfinate and amines was performed in an undivided cell with graphite anode and iron cathode in MeCN–H₂O medium using halides as redox mediators and supporting electrolytes.