The Sandmeyer Reaction is a chemical process used to synthesize aryl halides from aryl amines. It involves the conversion of an aryl amine into a diazonium salt, which is then treated with a copper(I) halide, such as CuCl or CuBr, to replace the diazonium group with a halogen atom. This reaction is particularly useful for introducing halogens into aromatic compounds. This reaction is named after the chemist Victor Sandmeyer, who developed the method in the late 19th century. The Sandmeyer Reaction is significant in organic chemistry for its ability to create diverse aryl halides, which are important intermediates in the synthesis of various pharmaceuticals and agrochemicals.