Palladium complexes bidentate diphosphine ligands

C. MECHANISM OF THE CROSS-COUPLING CATALYZED BY PALLADIUM(O) COMPLEXES LIGATED BY BIDENTATE DIPHOSPHINE LIGANDS (L-L)... 

C.i. Rate and Mechanism of the Oxidative Addition of Aryl Halides to Palladium(O) Complexes Ligated by Bidentate Diphosphine Ligands... 

B(3,5-(CF3)2C6H3)4-.512 Palladium complexes with a hemilabile terdentate carbene ligand, 1,3-bis(pyl)imidazol-2-ylidene, were active toward the catalytic polymerization of CO/norbornylene.513 Palladium complexes of cz s-bidentate C4-bridged diphosphines cis- and trans- 1,2-bis [(diphenylphosphino)methyl]cyclohexane, e fl o,e fl o-2,3-bis[(diphenylphosphino)methyl] norbornane,... 

Beletskaya disclosed the details of metallocene-bridged bidentate phosphine ligands [132], which can be considered as variations of the well-known dppf-derived palladium complexes, but with additional alkoxy substituents. The same group prepared a series of palladium complexes based on the monoxides of dppf, but their performance in catalytic aminations was lower than that of the corresponding diphosphine complexes [133]. 

A major breakthrough has been the finding that catalysts based on cationic palladium] 11) complexes with bidentate ligands, most often diphosphines, exhibit substantially increased activities in ethylene-carbon monoxide copolymerization by comparison to previously known nickel(ll) and palladium(II) systems [34—38]. Methanol is typically used as a reaction medium, demonstrating the stability of fhese catalysts towards protic media. 

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