Dimethylformamide facilitated the palladium–copper catalysed reaction of acetylene gas with aryl iodides in a closed system to give disubstituted acetylenes in fair to excellent yields. Use of chloroform as solvent gave mixtures of mono- and di-substituted acetylenes.
M. Pal and N. G. Kundu, J. Chem. Soc., Perkin Trans. 1, 1996, 449 DOI: 10.1039/P19960000449
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