Abstract
This review deals with the reactions of diarylplatinum(II) complexes with N-donor ligands to produce a variety of cycloplatinated compounds including endo-five-, endo-seven-, endo-six- or exo-five-membered platinacycles. The observed reactions result from a series of oxidative addition/reductive elimination processes taking place at platinum(II)/platinum(IV) species and involving C–X (X = H, Cl, Br) bond activation, arene elimination, and, in some cases, Caryl–Caryl bond formation.
Highlights
In recent years, research involving platinum complexes has focused on the study of their photophysical properties and their biological activities
Several diarylplatinum(II) compounds displaying monomeric or dimeric structures in which the square-planar coordination of the platinum is completed with labile ligands such as dimethylsulfoxide or dialkylsulfides have been shown to be useful in the synthesis of several classes of platinacycles containing N-donor ligands
The observed reactions result from a series of oxidative addition/reductive elimination processes involving platinum(II)/platinum(IV) species
Summary
Research involving platinum complexes has focused on the study of their photophysical properties and their biological activities. Other diarylplatinum(II) compounds such as [PtAr2(SMe2)2] (Ar = 4-MeC6H4; 4-MeOC6H4) have been shown to be efficient metallation agents in front of 2-phenylpyridine or benzo[h]quinoline ligands, and the assembly of the resulting cyclometallated organoplatinum complexes through bridging diphosphine ligands has been reported (see Scheme 3) [51,52] In these systems, the cyclometallation process involves oxidative addition of the C–H bond to the platinum(II) center to produce a platinum(IV) hydride complex, and subsequent reductive elimination of arene. Caryl–Caryl reductive elimination and a final Caryl–H bond activation leading to a five-membered cyclometallated platinum(II) compound with elimination of pentafluorobenzene as shown in Scheme 10 In this case, 19F NMR monitoring of the process allows the detection of all proposed intermediates. An example of Caryl–Caryl reductive coupling leading to a fluorinated biphenyl moiety [66]
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