Abstract
In this study, we report a copper-catalyzed ligand-free Cadiot-Chodkiewicz coupling reaction. No additives or ligands are required for this Cu-catalyzed C(sp)-C(sp) coupling reaction of terminal alkynes with alkynyl halides. The low cost of copper catalyst, excellent yield of the products, suppression of side-products and mild reaction conditions are the major advantages of this protocol.
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