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Copper-catalyzed, solvent-free oxidative homocoupling of terminal alkynes can be performed to 1,3-diynes in good to excellent yields in the absence of any additives, using air as environmentally friendly oxidant and the occurrence of water as an exclusive byproduct in the whole process. It is shown that AcO − of copper (II) acetate catalyst may take the role of base and found that the homocoupling...
A facile and efficient pathway for CuI/iodine-mediated homocoupling reaction of terminal alkynes to symmetrical 1,4-disubstituted 1,3-diynes in good to excellent yields was reported.
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