Supported organometallic complexes

A Heterogeneous Gold(I)-Catalyzed [2 + 2 + 1] Annulation of Terminal Alkynes, Nitriles, and Oxygen Atoms Leading to 2,5-Disubstituted Oxazoles

“…The MCM-41-immobilized phosphine gold­(I) complex [MCM-41–PPh 3 –AuNTf 2 ] was synthesized according to the procedure summarized in Scheme . First, the mesoporous material MCM-41 reacted with 1-(4-(diphenylphosphino)­phenyl)-3-(3-(triethoxysilyl)­propyl)­urea in toluene at 100 °C for 24 h, followed by the silylation with Me 3 SiCl in toluene at room temperature for 24 h to afford triphenylphosphine-functionalized MCM-41 (MCM-41–PPh 3 ). The latter was subsequently treated with Me 2 SAuCl and AgNTf 2 in dichloromethane (DCM) at room temperature to generate the MCM-41-immobilized phosphine gold­(I) complex [MCM-41–PPh 3 –AuNTf 2 ] as a gray powder, and the gold content of the complex was found to be 0.25 mmol g –1 according to the ICP-AES measurements.…”

Synthesis, characterization, crystal structure and chemical behavior of [1,1-bis(diphenylphosphinomethyl)ethene]ruthenium(II) complex toward primary alkylamine addition

“…Mixed diamine(phosphine)ruthenium(II) complexes have received much attention in recent years due to their remarkable performance in selective hydrogenation [11][12][13][14] and asymmetric hydrogenation of unsaturated carbonyl compounds [25][26][27][28][29][30][31][32]. Complexes such as 5 are very important in interphase chemistry.…”

Novel silica immobilized NCN-pincer palladium(II) and platinum(II) complexes: Application as Lewis acid catalysts

“…The properties of silica include thermal and chemical stability under reaction conditions, easily accessible and well-dispersed surface active sites (a high surface area >100 m 2 g −1 is required), and a mesoporous structure which is a prerequisite for liquid phase processes (pore size >20Å to avoid diffusion limitations) [17]. A wide range of homogeneous catalysts has been immobilized on silica and successfully recycled [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

“…In the first approach, the coordination sphere around the metal center changes during immobilization via various ligand exchange processes and the average structural properties of this immobilized complex could be quite different from those of the homogeneous complex. In the second approach, such changes may be minimal provided that the metal ion is strongly complexed to the ligand and that this configuration remains intact during grafting [18,26,27].…”