Adhikari and co-workers introduced diphenylthiourea (DPTU) 59 as an effective photocatalyst that, in its deprotonated state, facilitates reductive bond cleavage in aryl bromides to enable Csp²-Csp² and Csp²-Csp³ cross-coupling reactions (Scheme 20). Although DPTU 59 itself does not absorb visible light, in situ deprotonation alters the solution color to greenish-yellow, indicating the formation of the deprotonated species A. Upon photoexcitation, A undergoes SET to an aryl bromide, generating an aryl radical and a thiyl radical B. Radical B subsequently attacks the adjacent phenyl ring, forming a five-membered benzothiazole ring C. In the presence of a strong base (tBuOK), deprotonation of cyclohexenyl hydrogen in C yields radical anion D, a potent reducing species capable of further SET to cleave another aryl bromide bond. This sequence culminates in the formation of 2-anilinobenzothiazole 60, a critical step confirmed through stoichiometric isolation of 60. Notably, Schmidt and Argüello achieved the same transformation 59→60 using 1 mol% riboflavin 2′,3′,4′,5′-tetraacetate (RFTA) 21 under blue LED irradiation in ethanol, achieving a 41% yield within 3 hours.