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(a) Ligand‐based CuI‐catalyzed C−O coupling reactions of aryl halides with alcohols in toluene under Ar. [9] (b) Ligand‐free CuII‐catalyzed C−O coupling reactions of aryl halides with aliphatic diols under Ar. [10] (c) Unprecedented ligand‐free CuI‐ or CuII‐catalyzed C−O coupling reactions between aryl halides and alcohol‐based DESs in air.
