Olefin Complexes of Platinum

Synthesis of electron-rich platinum centers: Platinum0(carbene)(alkene)2 complexes

“…It appeared to be necessary to add more dmfu, as well as to stir the reaction mixture at elevated temperature (40-50°C). In situ preparation of Pt(cod) 2 by addition of cod to Pt(nbe) 3 [23] before adding the other reagents, can overcome this problem. However, employing Pt(cod) 2 is to be preferred, and leads to overall exhaustive displacement of cod by using two equivalents of dimethyl fumarate.…”

“…We added dihydrogen gas to the reaction mixture to see if the putative compound 6ax could be trapped by reaction with H 2 . This reaction was carried out in acetone-d 6 in an NMR tube and was followed (4) C(1)-Pt(1)-C (22) 96.96(10) C(1)-Pt(1)-C (28) 94.21(10) C(1)-Pt(1)-C (23) 136.16(10) C(1)-Pt(1)-C (29) 133.38 (10) by 1 H NMR spectroscopy. Indeed platinum hydrides were observed in the expected chemical shift-range similarly to known analogues [21] at about À14.5 ppm, indicating a hydride trans to an iodide, as in trans-hydrido 3,5-dimethyl-imidazol-2-yliden iodo 3,5-dimesitylimidazol-2-yliden platinum(II) (6ay) after reductive elimination of methane.…”

Nanocluster nucleation and growth kinetic and mechanistic studies: A review emphasizing transition-metal nanoclusters

“…In other words, water molecules or chloride ions can (and likely do) bond to Pt ions and atoms, for example, thereby stabilizing them and lowering the G of the reaction. Indeed, well-known molecular, M 0 compounds with ligands are stable and isolable, including Ru 0 (1,5-COD)(1,3,5-COT) (COT = cyclooctatriene) [82], Pt 0 (1,5-COD) 2 [83], Pt 0 2 (dba) 3 [84], and Pd 0 2 (dba) 3 [84] (dba = dibenzylideneacetone). The authors were left with the Pt I mechanism, which they proposed as the true mechanism of Pt 0 n nanocluster formation.…”

Convenient preparation of (η4-alkadiene)dichloroplatinum(II) complexes from [PtCl6]2− anions and their reduction to platinum(0) alkene complexes under phase-transfer catalysis conditions

“…This route affords satisfactory results both for platinum derivatives {for instance tris(bicyclo[2.2.1]heptene)platinum(0), [Pt(NB) 3 ], and bis(cycloocta-1,5-diene)platinum(0), [Pt(COD) 2 ], can be obtained in 40e74% yields [2f,3]} and for the usually unstable palladium compounds [2h,4]. Alternatively, dicyclopentadienylcobalt(II) [5] and samarium(II) iodide [6] have been reported as reducing agents for platinum(II) complexes.…”