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The most commonly method used for the synthesis of alkynyl calcogenides involves metal-assisted cross coupling reaction by using either Mg or Cu salts. 2 However, delicate reaction conditions or stoichiometric amount of metal salts were the main drawbacks for these protocols. On the other hand, CuO nanopowder has emerged as a useful catalyst in several transformations, and it has also been employed with success in the synthesis of organochalcogenides. 3

An Efficient Synthesis of Alkynyl Selenides and Telurides from Terminal Acetylenes and Diorganoyl Dichalcogenides Catalyzed by Copper Oxide Nanopowder