SEARCH Articles Figures Tables Catalyst ligand Catalyst metal-free organic ligands Catalyst-free Free ligand IR studies on Ligand-free Rhodium Carbonyl Catalysts Ligand free metal catalyst Ligand-free Palladium Catalysts Ligand-free catalysts Heck reaction Ligand-free catalysts basic mechanisms Rhodium carbonyl catalyst, ligand-free Sonogashira coupling reaction ligand-free catalysts Sonogashira reaction ligand-free catalysts Suzuki ligand-free catalysts