13959-92-7Relevant articles and documents
Wettability-Driven Palladium Catalysis for Enhanced Dehydrogenative Coupling of Organosilanes
Lin, Jian-Dong,Bi, Qing-Yuan,Tao, Lei,Jiang, Tao,Liu, Yong-Mei,He, He-Yong,Cao, Yong,Wang, Yang-Dong
, p. 1720 - 1727 (2017)
Direct coupling of Si-H bonds has emerged as a promising strategy for designing chemically and biologically useful organosilicon compounds. Heterogeneous catalytic systems sufficiently active, selective, and durable for dehydrosilylation reactions under mild conditions have been lacking to date. Herein, we report that the hydrophobic characteristics of the underlying supports can be advantageously utilized to enhance the efficiency of palladium nanoparticles (Pd NPs) for the dehydrogenative coupling of organosilanes. As a result of this prominent surface wettability control, the modulated catalyst showed a significantly higher level of efficiency and durability characteristics toward the dehydrogenative condensation of organosilanes with water, alcohols, or amines in comparison to existing catalysts. In a broader context, this work illustrates a powerful approach to maximize the performance of supported metals through surface wettability modulation under catalytically relevant conditions.
Homogeneous gold-catalyzed hydrosilylation of aldehydes
Lantos, Diána,Contel, María,Sanz, Sergio,Bodor, Andrea,Horváth, István T.
, p. 1799 - 1805 (2007)
The catalytic hydrosilylation of aldehydes in the presence of PBu3 modified Au(I)-complexes was investigated. In situ IR and NMR experiments have revealed that both, the ligand PBu3 and the substrate aldehyde play an important role in stabilizing the gold catalyst and/or forming the catalytically active species. In their absence the reducing power of silane destabilizes the gold (I) catalyst giving rise to gold clusters or particles. Several side reactions involving water and oxygen were also investigated. A plausible reaction pathway as an alternative to the well-accepted mechanism for the transition-metal homogeneously catalyzed hydrosilylation of aldehydes has been proposed to accommodate the experimental observations.
West et al.
, p. 282 (1971)
Solventless silane alcoholysis catalyzed by recoverable dirhodium(II) perfluorocarboxylates
Biffis, Andrea,Braga, Mirko,Basato, Marino
, p. 451 - 458 (2004)
We have developed a novel reaction protocol for the highly efficient and sustainable catalysis of the silane alcoholysis reaction. The catalysts of choice are dirhodium(II) perfluorocarboxylates bearing long perfluoroalkyl chains, which are easily prepare
Copper (I) 1,3-R2-3,4,5,6-tetrahydropyrimidin-2-ylidenes (R=mesityl, 2-propyl): Synthesis, X-ray structures, immobilization and catalytic activity
Bantu, Bhasker,Wang, Dongren,Wurst, Klaus,Buchmeiser, Michael R.
, p. 12145 - 12152 (2005)
The synthesis of novel copper (I) N-heterocyclic carbene complexes is described. Thus, reaction of CuX with 1,3-di(2-propyl)-3,4,5,6- tetrahydropyrimidin-2-ylidene yields CuX(1,3-di(2-propyl)-3,4,5,6- tetrahydropyrimidin-2-ylidene) (X=Cl, (1a), Br (1b));
Synthesis and Reactivity of Zr MOFs Assembled from PNNNP-Ru Pincer Complexes
Kassie, Abebu A.,Duan, Pu,Gray, Matthew B.,Schmidt-Rohr, Klaus,Woodward, Patrick M.,Wade, Casey R.
, p. 3419 - 3428 (2019)
Three isostructural Zr metal-organic frameworks have been synthesized from PNNNP-Ru pincer metallolinkers bearing different combinations of ancillary ligands (1, Zr6O4(OH)4(OAc)4{cis-(Psup
Cationic Dirhodium Complexes Bridged by 2-Phosphinopyridines Having an Exquisitely Positioned Axial Shielding Group: A Molecular Design for Enhancing the Catalytic Activity of the Dirhodium Core
Ohnishi, Ryuhei,Ohta, Hidetoshi,Mori, Shigeki,Hayashi, Minoru
, p. 2678 - 2690 (2021/07/31)
This report describes a strategy to create highly electrophilic dirhodium catalysts. The electrophilicity of lantern-Type dirhodium complexes is generally decreased by the coordination of a ligand to the axial site, which often causes a reduction in the catalytic activity. We designed and synthesized a series of cationic dirhodium complexes bridged by 2-diarylphosphinopyridines having a bulky 2,4,6-Triisopropylphenyl (Tip) group that can prevent the attack of external molecules to the closest axial site. Theoretical calculations indicated that the Tip group weakly interacts with the axial site but hardly reduces the electrophilicity of the dirhodium core. The complexes served as excellent catalyst precursors for the dehydrogenative silylation of alcohols using hydrosilanes under mild conditions and a low metal loading, producing the silyl ethers in higher yields in comparison to conventional dirhodium complexes.
Catalytic Reductive Cross-Coupling between Aromatic Aldehydes and Arylnitriles
Mitsui, Atsuhisa,Nagao, Kazunori,Ohmiya, Hirohisa
supporting information, p. 7094 - 7098 (2021/04/16)
A reductive cross-coupling reaction between aromatic aldehydes and arylnitriles using a copper catalyst and a silylboronate as a reductant is reported. This protocol represents an unprecedented approach to the chemoselective synthesis of α-hydroxy ketones by electrophile–electrophile cross-coupling.