A unimolecular tetrakis-piperidine-4-ol has been developed as an efficient ligand in combination with Pd/C for copper and amine free Sonogashira coupling. Various aryl and heteroaryl iodides were successfully coupled with aliphatic and aromatic alkynes to give internal alkynes in good to excellent yields.
P. H. Patil and R. A. Fernandes, RSC Adv., 2015, 5, 54037 DOI: 10.1039/C5RA07754K
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