Abstract
This chapter provides an overview over the recent developments and the early examples of functionalizing arenes by visible light induced processes. The examples on arene functionalization by visible light photoredox catalysis described in this chapter demonstrate the great potential of the transformation in organic synthesis and for applications in material chemistry. The Ullmann reaction for the ...
Abstract
This chapter provides an overview over the recent developments and the early examples of functionalizing arenes by visible light induced processes. The examples on arene functionalization by visible light photoredox catalysis described in this chapter demonstrate the great potential of the transformation in organic synthesis and for applications in material chemistry. The Ullmann reaction for the construction of C—N bonds was first reported in 1903 for the synthesis of arylamines fromreadily available aryl halides and amines using stoichiometric amounts of copper at elevated temperatures. Sulfonium salts have found many applications in organic synthesis. Aryl diazonium salts bearing both electron‐donating and electron‐withdrawing groups reacted smoothly to give the corresponding products in moderate to good yields. Diaryl iodonium salts having tetrafluoroborate as counter anion were found to be more efficient than the analogous triflate salts. Aryl radicals were generated from the corresponding aryl sulfonyl chlorides.
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