Photochemical Sandmeyer-type Halogenation of Arenediazonium Salts

Trihalide salts were found to efficiently promote photochemical dediazotizing halogenations of diazonium salts. In contrast to classical Sandmeyer reactions, no metal catalysts are required to achieve high yields and outstanding selectivities for halogenation over competing hydridodediazotization. Convenient protocols are disclosed for synthetically meaningful brominations, iodinations, and chlorinations of diversely functionalized derivatives.

Automated summary

This study explores the application of Trihalide salts in photochemical dediazotizing halogenations, revealing that high yields and outstanding selectivities for halogenation can be achieved without the need for metal catalysts. In addition, convenient protocols are disclosed for the brominations, iodinations, and chlorinations of diverse functionalized derivatives.