Chromoselective bond activation has been achieved in organic helicenium (Pr-DMQA)-based photoredox catalysis. Consequently, control over chromoselective C(sp)-X bond activation in multihalogenated aromatics has been demonstrated. Pr-DMQA can only initiate the halogen atom transfer (XAT) pathway under red light irradiation to activate low-energy-accessible C(sp)-I bonds. In contrast, blue light irradiation initiates consecutive photoinduced electron transfer (conPET) to activate more challenging C(sp)-Br bonds. Comparative reaction outcomes have been demonstrated in the α-arylation of cyclic ketones with red and blue lights. Furthermore, red-light-mediated selective C(sp)-I bonds have been activated in iodobromoarenes to keep the bromo functional handle untouched. Finally, the strength of the chromoselective catalysis has been highlighted with two-fold functionalization using both photo-to-transition metal and photo-to-photocatalyzed transformations.
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