Ligand-free palladium-catalyzed decarboxylative coupling reactions of aryl iodides and alkynyl carboxylic acids

Pd-CNT nanocomposite was prepared from the composite of thiolated MWNT and Na2PdCl4. The palladium nanoparticles possess an average diameter of 2.9 nm with a narrow size distribution for the Pd-CNT. This Pd-CNT showed good activities in the coupling reactions of aryl iodides and aryl alkynyl carboxylic acids to produce the diaryl alkynes in good yields without any additional ligand.

Graphical abstractPd-CNT nanocomposite was prepared, and showed good catalytic activity in the decarboxylative coupling reaction of aryl alkynyl carboxylic acids and aryl iodides.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Pd-CNT nanocomposite was prepared from the composite of thiolated MWNT and Na2PdCl4. ► Pd-CNT nanocomposite showed good catalytic activity in the decarboxylative couplings. ► Diaryl alkynes were synthesized in good yields.