Rhodium-Catalyzed/Copper-Mediated Tandem C(sp²)–H Alkynylation and Annulation: Synthesis of 11-Acylated Imidazo[1,2-<i>a</i>:3,4-<i>a</i>′]dipyridin-5-ium-4-olates from 2<i>H</i>-[1,2′-Bipyridin]-2-ones and Propargyl Alcohols

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