Direct functionalization of CÀH bonds has been a hot topic in organic chemistry during recent years.[1–11] Arenes—one of the most abundant chemical motifs—usually have multiple CÀH bonds. Although, some examples of direct functionalizations of arenes have been reported recently,[1, 3] the selectivity of CÀH bond activation remains a challenge (Scheme 1 A).[5] Several strategies have been applied to achieve selective CÀH ...
