Hypervalent iodine compounds (iodanes) have found widespread applications as electrophilic group transfer reagents, as mild oxidants for the synthesis of natural products and in organo-and photocatalysis. Diaryliodonium salts are an important subclass among iodanes, which are commonly applied as electrophilic arylation reagents for transition-metal-catalyzed and metal-free arylations. In this regard, cyclic diaryliodonium salts which are characterized by two aryl moieties directly connected or bridged with carbon or heteroatoms have been utilized for the effective synthesis of mono-and double-functionalized diaryl-based molecules through regioselective ring opening with a wide range of nucleophiles. They can also be applied as starting materials for the synthesis of annulated hetero-and carbocycles.