The supported copper hydroxide on titanium oxide (Cu(OH)x/TiO2) has been shown to act as an efficient heterogeneous catalyst for the oxidative alkyne–alkyne homocoupling. A wide variety of alkynes including aromatic, aliphatic, double-bond-containing, and silylacetylene derivatives were selectively converted into the corresponding diyne derivatives in high yields without any additives such as bases.
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Oishi et al. (2009) studied this question.
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