Diynes were synthesized in high yields by homocoupling of terminal arylacetylenes and terminal alkylacetylenes in Cu(OAc)2‐PEG (polyethyleneglycol) with NaOAc as a base. Cu(OAc)2‐PEG was readily recycled via solvent precipitation with efficient recyclability.
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Lü et al. (2006) studied this question.
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