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Pyrazolyl ligands have been used to prepare metal complexes since the mid-1960s as nitrogen-donor ligands. However, unlike other nitrogen-donor ligands like imines and pyridines, their metal complexes have not been used extensively in catalysis. This review highlights the emergence of pyrazolyl metal complexes as nitrogen-donor catalysts, particularly in carbon–carbon coupling reactions. The focus...
Two types of pyrazole-based palladium complexes were used to catalyze the polymerization of phenylacetylene. Catalysts with electron-withdrawing linkers, [{1,3-(3,5-R 2 pzCO) 2 C 6 H 4 }Pd 2 Cl 2 (μ-Cl) 2 ] (R= t Bu (1), Ph (2), Me (3), [{2,6-(3,5-R 2 pzCO) 2 C 5 H 3 N)}PdCl 2 ] (R= t Bu...
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