Abstract
Heterogeneous Cu-MnO-catalyzed selective monohalogenation of aromatic compounds with cheap N-halosuccinimide (NXS) as a halogenating agent in the presence of molecular oxygen as an oxidant, under irradiation with visible light is reported. Monochlorination, bromination, and iodinations were achieved in a highly selective fashion. Our developed heterogeneous Cu-MnO catalyst without any additive and ligands works well for halogenation with electron-rich substrates and also works selectively with electron poor substrates. Moreover, chlorination occurs efficiently with the more challenging substrates benzoic esters. The heterogeneous nature of the reaction was proven by hot filtration test.
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