10217-34-2Relevant articles and documents
Highly-active, graphene-supported platinum catalyst for the solventless hydrosilylation of olefins
Kong, Caleb J.,Gilliland, Stanley E.,Clark, Brian R.,Gupton, B. Frank
, p. 13343 - 13346 (2018)
Herein we report the development of the first graphene-supported platinum catalyst that has demonstrated exceptional catalytic activity and stability for hydrosilylation reactions of olefins (TOF 4.8 × 106 h-1, TON = 9.4 × 106). The catalyst also exhibited functional group tolerance over a broad range of industrially relevant substrates with minimal metal leaching. In addition, the catalyst system was successfully translated into a packed bed platform for continuous hydrosilylation reactions.
N,N-Dimethylformamide-protected Fe2O3 Combined with Pt Nanoparticles: Characterization and Catalysis in Alkene Hydrosilylation
Kanda, Yasuharu,Kondo, Ryota,Lin, Xianjin,Nagata, Tatsuki,Obora, Yasushi,Shimizu, Ken-ichi,Suzuki, Takeyuki,Tanaka, Tatsuya,Toyao, Takashi
, (2021/11/30)
We report a combination of N,N-dimethylformamide (DMF)-protected Fe2O3 nanoparticles (NPs) and Pt NPs for the hydrosilylation of various industrially relevant alkenes and tertiary silanes. The DMF-protected Fe2O3 and Pt NPs catalysts were characterized by transmission electron microscopy, X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy. The catalyst of DMF-protected Fe2O3 NPs combined with Pt NPs can be recycled for five cycles by a simple extraction using hexane/DMF. The developed combination Fe2O3/Pt NPs catalyst is effective up to the 1-kilogram scale.
Organic silicon coupling agent and preparation method thereof
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Paragraph 0090-0093, (2019/10/01)
The invention provides an organic silicon coupling agent and a preparation method thereof. The method is characterized in that a silane group-containing molecule and an alkylene group-containing molecule undergo a hydrosilylation reaction under the catalysis of a highly selective hydrosilylation catalyst to generate the organic silicon coupling agent. The highly selective hydrosilylation catalystutilizes alkene and platinum atoms to form a weak coordination bonds in order to facilitate the activation of the platinum atoms, an organic cage ligand avoids the agglomeration of the platinum atoms,and a spatial three-dimensional structure formed by the complex catalyst can produce a very large steric hindrance, so the selectivity of the hydrosilylation product is greatly improved. The preparation method of the invention is used to prepare the novel coupling agent by a hydrosilylation reaction which cannot be catalyzed by a Karstedt's catalyst.
DEHYDROGENATIVE SILYLATION, HYDROSILYLATION AND CROSSLINKING USING PYRIDINEDIIMINE COBALT CARBOXYLATE CATALYSTS
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Page/Page column 58; 59, (2017/02/24)
A process for producing a silylated product comprises reacting a mixture comprising (a) an unsaturated compound containing at least one unsaturated functional group, (b) a silyl hydride containing at least one silylhydride functional group, and (c) a catalyst, optionally in the presence of a solvent, to produce a dehydrogenative silylated product, a hydrosilylated product, or a combination of a dehydrogenative silylated product and a hydrosilylated product, wherein the catalyst is chosen from a pyridine diimine cobalt dicarboxylate complex or a cobalt carboxylate compound, and the process is conducted without pre-activating the catalyst via a reducing agent and/or without an initiator or promoter compound. The present catalysts have been found to be active in the presence of the silyl hydride employed in the silylation reaction.
Mode of activation of cobalt(II) amides for catalytic hydrosilylation of alkenes with tertiary silanes
Liu, Yang,Deng, Liang
supporting information, p. 1798 - 1801 (2017/02/15)
Cobalt(II) complexes capable of catalyzing alkene hydrosilylation in the absence of external activators are rarely known, and their activation mode has remained poorly understood. We present here that cobalt(II) amide complexes, [Co(N(SiMe3)2)2] and its NHC adducts [(NHC)Co(N(SiMe3)2)2] (NHC = N-heterocyclic carbene), are effective catalysts for the hydrosilylation of alkenes with tertiary silanes. Mechanistic studies revealed that cobalt(II) amides can react with hydrosilane to form cobalt(I) species, silylamide, and hydrogen, which serves as the entry to the genuine catalytically active species, presumably cobalt(I) species, for the cobalt-catalyzed hydrosilylation reaction.
Bench-Stable, Substrate-Activated Cobalt Carboxylate Pre-Catalysts for Alkene Hydrosilylation with Tertiary Silanes
Schuster, Christopher H.,Diao, Tianning,Pappas, Iraklis,Chirik, Paul J.
, p. 2632 - 2636 (2016/04/26)
High-spin pyridine diimine cobalt(II) bis(carboxylate) complexes have been synthesized and exhibit high activity for the hydrosilylation of a range of commercially relevant alkenes and tertiary silanes. Previously observed dehydrogenative silylation is suppressed with the use of sterically unencumbered ligands, affording exclusive hydrosilylation with up to 4000 TON. The cobalt precatalysts were readily prepared and handled on the benchtop and underwent substrate activation, obviating the need for external reductants. The cobalt catalysts are tolerant of epoxide, amino, carbonyl, and alkyl halide functional groups, broadening the scope of alkene hydrosilylation with earth-abundant metal catalysts.
