An efficient halogenation reaction has been developed with diaryliodonium salts and cuprous halides. Various
diaryliodonium salts 1 could perform the reaction with readily available CuBr or CuCl in CH3CN at 80°C, assembling
bromoarenes or chloroarenes in up to 92% yields. This provides us a method for the transformation from iodoarenes to
Keywords: Diaryliodonium salts, Halogenation, Cuprous halide, Aromatic halides, Iodoarenes.
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