Rapid and General Access to <i>α</i>‐Halogenated Carbonyl Compounds Using Amidine Halide Salts as Halogen Sources under Mild Conditions

Abstract Rapid and efficient construction of α ‐haloketones with diazo compounds and amidine ⋅ HX (X=Cl, Br, I) salts as halogen sources has been recognized as a simple and practical strategy. The reaction exhibits a broad scope and scalability, thereby enabling synthesis of a broad spectrum of functionally orchestrated α ‐haloketones under mild and metal‐free conditions in a short time. Control experiments established the involvement of triffate 10 in the mechanism.