The metal catalyst can activate the alkyne by weakening the carbon-carbon triple bond. This can be achieved through metal-carbon π-bond interactions.
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(2E)-2-ethylidenetetrahydrofuran
(E)-(ethene-1,2-diyl-1-d)dibenzene
4-chloro-2-(phenylethynyl)benzaldehyde
1,2,3-triphenyl-1H-inden-1-ylamine
1-bromo-2-(3,3,3-trifluoroprop-1-yn-1-yl)benzene
