Abstract
Abstract A reusable ionic liquid 1-butyl-3-methylimidazolium bromide/Cu(II) system was proven to be a reusable catalyst for the homocoupling of terminal alkynes at mild temperature using air as oxidant in aqueous phase or under solvent-limited conditions. In most cases, good to excellent yields can be achieved, either aromatic alkynes or aliphatic alkynes were used as substrates. The homocoupling products 1,3-diynes were separated by extraction from the reaction system. And the activity of residue showed it could be reused for 3 and 6 cycles respectively under the aqueous phase conditions and solvent-limited conditions. Furthermore, this reaction can be easily scaled up to gram level.
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