14 Organic Dyes in Photocatalytic Reductive C–H Arylations

In recent years, visible-light photoredox catalysis has gained enormous attention as an energy-efficient and versatile method for chemical synthesis. This chapter presents synthetically important C–H arylation reactions using inexpensive organic dyes (e.g., eosin Y, rhodamine 6G, perylene bisimides, etc.) under visible-light photoredox catalytic reaction conditions. Single-electron transfer to arenediazonium salts or aryl halides leads to the formation of aryl radicals, which, under the reaction conditions, react with (het)arenes to yield the respective C–H arylated products.