Functionalization of C(sp²)–H Bonds of Arenes and Heteroarenes Assisted by Photoredox Catalysts for the C–C Bond Formation

The formation of C–C bonds from arenes and heteroarenes through transition metal-catalyzed C–H bond functionalizations is one of the major achievements of these last decades. It is now possible to perform such transformations under mild reaction conditions with the help of visible light photocatalysis leading to eco-friendly and safer process to build organic molecules or materials. This chapter will focus on photoredox catalysis which involves a C(sp²)–H bond functionalization step for the formation of C(sp²)–C bonds [i.e., direct arylations and (perfluoro)alkylations] and will show how this hot topic contributes to the development of green chemistry.