In 2023, Ritter et. al. reported a three-component late stage 1,2-azidoarylation of alkenes utilizing arylthianthrenium salts catalyzed by Cu(CH3CN)4BF4 and BINAP under blue light (Figure ). The reaction exhibited compatibility with derivatives of complex molecules with diverse functional groups delivering desired products in 40-71% yields. A broad scope of alkenes including mono-, di-, and tri-substituted Michael acceptors, styrenes, and unactivated alkenes proved to be successful radical acceptors. The comprehensive range of substrates provided rapid access to a wide range of complex arylethylazides (Figure and). Cu(CH3CN)4BF4, BINAP, and sodium azide in-situ form Cu(BINAP)N3 (19.5), structure confirmed by X-Ray crystallography, which is the active catalyst, and provides 71% yields of 19.8 under standard conditions (Figure ). The luminescence of excited Cu(BINAP)N3 was effectively quenched by the aryl thianthrenium salts supporting the oxidative quenching cycle of copper. Moreover, catalyst 19.11 was able to serve as a standalone azide transfer agent to a mixture of benzoyl peroxide and acrylonitrile in CH3CN (Figure ), suggesting that post the aryl radical addition to the alkene, the radical can directly capture azide from 19.11 through an outer-sphere mechanism (Figure ).