The development of homogeneous photoredox catalysts in radical coupling reactions has been truly phenomenal, and the generation of new carbon–carbon bonds in an atom economical manner is a continuous pursuit in synthetic organic chemistry. This enables the production of many pharmaceutical compounds and bio-active molecules. The use of photoredox catalysts has quickly realized the huge potential in organic synthesis to afford facile coupling reactions enabled by photo-energy. Many excellent examples have been seen in the literature, including couplings of carbonyl-a-radicals [ 1 ] and ketyl radicals (e.g. the Pinacol Coupling Reaction, PCR) [ 2 ]. However, despite many successful applications of photoredox catalysts in radical coupling reactions, with some exceptions the scarce and expensive ruthenium (Ru) and iridium (Ir)-based homogeneous catalysts are predominantly used, which are difficult to isolate and recycle at the end of the reactions. Over the past few years, engineering of g...