“…The most widely used Cu‐based catalytic systems employ ethylenediamine, 1,10‐phenanthroline, 1,4‐diphenyl‐1,4‐diazabuta‐1,3‐diene, 1,4‐diazabicyclo[2.2.2]octane (DABCO) or N , N′ ‐dibenzyl‐BINAM . In most cases, a large excess (up to 30 %) of the multi‐dentate ligand is required . Other synthetic protocols employ multinuclear copper complexes bridged by N‐donor ligands, copper nanoparticles, microwave‐assisted reactions, or Cu‐catalyzed Sonogashira couplings under blue LED light irradiation , …”