Abstract
In typical catalytic organic transformations, transition metals in catalytically active complexes are present in their most stable valence states, such as palladium(0) and (II). However, some dimeric monovalent metal complexes can be stabilized by auxiliary ligands to form diamagnetic compounds with metal–metal bonding interactions. These diamagnetic compounds can act as catalysts while retaining their dimeric forms, split homolytically or heterolytically into monomeric forms, which usually have high activity, or in contrast, become completely deactivated as catalysts. Recently, many studies using group 10 metal complexes containing nickel and palladium have demonstrated that under specific conditions, the active forms of these catalyst precursors are not mononuclear zerovalent complexes, but instead dinuclear monovalent metal complexes. In this mini-review, we have surveyed the preparation, reactivity, and the catalytic processes of dinuclear nickel(I) and palladium(I) complexes, focusing on mechanistic insights into the precatalyst activation systems and the structure and behavior of nickel and palladium intermediates.
Highlights
Interest in the development of catalytic organic transformations using well-defined palladium and nickel complexes as active catalysts continues to increase [1,2,3,4,5,6,7,8,9,10]
Cooperative activation of organic compounds by bimetallic complexes has been reported in organometallic reactions of cluster compounds [17,18,19,20], the mechanism by which dinickel(I) or dipalladium(I) complexes act in catalytic transformations is poorly understood
Complex, which produced tetraphenylene catalytically in the presence of biphenylene upon heating, accompanied by regeneration of the dinuclear bis(biphenyl) complex. These results indicated that the unsaturated dinickel(I) system can be effective for catalytic reactions involving concerted activation of substrates by a pair of active metal centers
Summary
Interest in the development of catalytic organic transformations using well-defined palladium and nickel complexes as active catalysts continues to increase [1,2,3,4,5,6,7,8,9,10]. In 1996, Mingos et al reported the first example of catalytically active monovalent dipalladium complexes, 1a The structure of these complexes was determined by X-ray crystallography, which showed the. Murahashi and Kurosawa et al reported a good starting complex for the preparation of various cationic dinuclear Pd(I) complexes via ligand exchange reaction, [Pd2(NCCH3)6]2+ (2) [25]. This complex was used as a precursor for the bis-dmpm bridged dipalladium(I) dication,. Various cationic dinuclear Pd(I) complexes via ligand exchange reaction, [Pd2 (NCCH3 )6 ]2+ (2) [25] This complex was used as a precursor for the bis-dmpm bridged dipalladium(I) dication, 2+.
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