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The common access to forming CN bond is the copper‐catalyzed Ullmann‐type reaction. The relatively expensive and easily oxidized copper(I) is usually used in the reaction. Our group discovered that the “vitamin C/glycerol” reduction system could convert cheap and stable CuO to active low valence state copper species, as measured via X‐ray photoelectron spectroscopy (XPS), to promote the CN coupling...
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