Palladium complexes nitrogen ligands

In 1991, Elsevier reported other nitrogen ligand-containing complexes as active hydrogenating catalysts. Palladium(O) complexes containing the Ar-bian bis-imine... 

Chen and coworkers have synthesized a hybrid NHC-l,2,3-triazole tridentate ligand and its Ag(I), Pd(II), and Pt(II) complexes. Crystallography confirmed the tridentate coordination mode with the triazole unit bound through the N3 nitrogen. The palladium complex, 87, was found to be a highly active catalyst for the... 

Palladacycle 5 reacts in various ways depending on ligands and reaction conditions. In particular it readily undergoes oxidative addition of alkyl halides to form a palladium(IV) complex 6, which has been isolated and characterized with stabilizing nitrogen ligands such as phenanthroline. This palladium(IV) metallacycle... 

Nitrogen nucleophiles, in a similar manner to oxygen- and sulfur-based functionality, undergo transition metal-catalyzed cross-coupling with halopyridines. The use of palladium(O) catalysts is most effective in combination with chelating bis-(phosphine) ligands such as BINAP that prevent the formation of pyridine-palladium complexes that... 

The coordination of catenated nitrogen ligands to transition metals also dates back to the early work of Griess 89, 90), which included references to copper and silver derivatives of 1,3-diphenyltriazene. Around the turn of the century Meldola and Streatfeild 146-148), Meunier 150-152), Niemen-towski and Roszkowski 159), Cuisa and Pestalozza 55,56), and others reported extensively on triazene complexes of copper, silver, and mercury, and in the late 1930s and early 1940s Dwyer and colleagues 69-74) extended this work to include derivatives of nickel and palladium. However, most work on the coordination chemistry of triazenes and other catenated... 

Organometallic complexes of PdIV were almost unknown until a few years ago. They are however accessible by the oxidative addition of Mel or PhCH2Br to palladium dialkyl complexes stabilized by nitrogen ligands such as bipy. Most are thermally sensitive and reductively eliminate R—Me at room temperature.49 The first PdIV silyl complex was obtained in a clean methyl exchange reaction between (dmpe)PdMe2 and l -QH SiFI the compound is thermally remarkably stable.50... 

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