An Improved Procedure for the Synthesis of Substituted Acetylenes from the Reaction of Acetylene Gas with Aryl Iodides under Palladium-Copper Catalysis.

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.