A highly efficient strategy for the synthesis of benzothiazoles 34 was introduced in 2023 (Scheme 9) . This method involves the visible-light-induced reaction of 2-aminothiophenol with methylarenes in the presence of eosin Y 18 as a photocatalyst, using a green solvent mixture of ethanol and water, with atmospheric air as the oxidant under ambient conditions. Remarkably, both electron-donating and electron-withdrawing substituents on arenes exhibited comparable reactivity. The mechanism (Scheme 9) begins with the excitation of eosin Y 18 under blue light to form the highly reactive species EY*. A SET between EY* and methylarene generates a radical cation intermediate A while reducing EY to its ground state. Simultaneously, molecular oxygen is converted into superoxide ions, which react with water to produce hydrogen peroxide and regenerate O₂. Intermediate A undergoes proton abstraction to form benzylic radical B, which reacts with oxygen to form peroxy-species C. Further H-radical abstraction produces benzyl hydroperoxide D, which dehydrates to form benzaldehyde. The aldehyde subsequently reacts with 2-aminothiophenol, following mechanisms similar to earlier works , to yield the desired benzothiazole product.