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More recently,Yu group disclosed the first Pd-catalyzed C(sp3)-H functionalization of aldehydes and ketones using transient directing group(TDG) strategy.Herein,we report a diverse series of ortho-C(sp2)-H functionalization reactions of benzaldehydes using transient directing group strategy.This approach allows a site-selective formation of C(sp2)-Cl,C(sp2)-Br bonds in the presence of stronger directing groups such as amides,carbamates,and heterocycles.Scheme1.Catalytic,Selective Directed C-H Functionalization with Multiple Coordinating Groups.