桑德迈尔反应（Sandmeyer反应）是重氮盐在CuX的催化下与卤素盐类反应产生卤代烃的化学反应。

其中X可以为溴、氯或氰基负离子。

其机理如下（之前的重氮化反应略去）：

The Sandmeyer reaction is a chemical reaction used to synthesize aryl halides from aryl diazonium salts. It is named after the Swiss chemist Traugott Sandmeyer. The reaction is a method for substitution of an aromatic amino group via preparation of its diazonium salt followed by its displacement with a nucleophile, often catalyzed by copper(I) salts. The nucleophile can include halide anions, cyanide, thiols, water, and others. The reaction does not proceed well with the fluoride anion, but fluorination can be carried out using tetrafluoroborate anions (Balz–Schiemann reaction).