Patent ID: 6419814
Filing Date: 2002-07-16
Classification: C25B

Abstract:
A method for making diaryliodonium salts of the structure:Y-Aryl-I+-Arylâ€²-Z, which comprises the steps of:(i) introducing an electrolysis reaction mixture into an electrochemical cell equipped with a cathode and an electrically conductive carbon anode, said electrolysis reaction mixture comprising an aryliodide, Y-Aryl-I; an aromatic substrate, H-Arylâ€²-Z and a reaction medium comprising a strong acid electrolyte; a lower carboxylic acid and an acid anhydride in an amount ranging from about 15 to about 50 percent by-weight, said Aryl of said Y-Aryl-I comprising at least one aromatic carbocyclic ring or heterocyclic ring structure and Y is at least one coupling reaction promoting substituent bonded to said Aryl, said Arylâ€² of said H-Arylâ€²-Z comprising at least one aromatic carbocyclic ring or heterocyclic ring structure each with at least one nuclear hydrogen and Z is at least one coupling reaction promoting substituent bonded to said Arylâ€², and (ii) imposing a voltage across said anode and cathode of said electrochemical cell to electrolyze said electrolysis reaction mixture to provide improved yields of said diaryliodonium salts.