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The Sandmeyer reaction is a chemical reaction used in organic chemistry to synthesize aryl halides from aryl diazonium salts. It involves the reaction of an aryl diazonium salt with cuprous halide (CuX) in the presence of a suitable catalyst, such as copper(I) oxide (Cu2O) or copper(I) chloride (CuCl), to yield the corresponding aryl halide. The reaction is named after the Swiss chemist, Traugott Sandmeyer, who discovered it in 1884.