- MCM-41-supported mercapto platinum complex as a highly efficient catalyst for the hydrosilylation of olefins with triethoxysilane
-
A novel MCM-41-supported mercapto platinum complex was conveniently synthesized from commercially available and cheap γ-mercaptopropyltriethoxysilane via immobilization on MCM-41, followed by reacting with potassium chloroplatinite. The powder X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were employed to characterize the title platinum complex. It was found that the title complex is an efficient catalyst for hydrosilylation of olefins with triethoxysilane and can be reused several times without noticeable loss of activity.
- Hu, Ronghua,Zha, Lingfang,Cai, Mingzhong
-
-
Read Online
- N,N-Dimethylformamide-protected Fe2O3 Combined with Pt Nanoparticles: Characterization and Catalysis in Alkene Hydrosilylation
-
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.
- Kanda, Yasuharu,Kondo, Ryota,Lin, Xianjin,Nagata, Tatsuki,Obora, Yasushi,Shimizu, Ken-ichi,Suzuki, Takeyuki,Tanaka, Tatsuya,Toyao, Takashi
-
-
- METHOD FOR PRODUCING ORGANOSILICON COMPOUND BY HYDROSILYLATION WITH METALLIC-ELEMENT-CONTAINING NANOPARTICLES
-
An organosilicon compound can be efficiently produced by using metallic element-containing nanoparticles such as a platinum element-containing nanoparticle having a solvent on surface as a catalyst of the hydrosilylation reaction of alkenes.
- -
-
Paragraph 0097-0116
(2019/11/21)
-
- Waste-free and efficient hydrosilylation of olefins
-
High purity silicone precursors can now be synthesized by hydrosilylation of solvent-free olefins catalyzed by a highly stable and active glass hybrid catalyst consisting of mesoporous organosilica microspheres doped with Pt nanoparticles. These findings open the door to the sustainable manufacture of silicone and a way to further reduce the amount of platinum in silicones, which are ubiquitous advanced polymers with multiple uses and applications.
- Pandarus, Valerica,Ciriminna, Rosaria,Gingras, Geneviève,Béland, Fran?ois,Kaliaguine, Serge,Pagliaro, Mario
-
p. 129 - 140
(2019/01/11)
-
- The effect of an acylphosphine ligand on the rhodium-catalyzed hydrosilylation of alkenes
-
We synthesized a series of acylphosphines and investigated the hydrosilylation of alkenes that were catalyzed using RhCl3/acylphosphine. The results indicated that RhCl3/(diphenylphosphino) (phenyl)methanone exhibited higher activity as well as higher levels of β–adduct selectivity.
- Li, Jiayun,Yang, Chuang,Bai, Ying,Yang, Xiaoling,Liu, Yu,Peng, Jiajian
-
-
- Synthesis of a fumed silica-supported poly-3-(2-aminoethylamino)propylsiloxane platinum complex and its catalytic behavior in the hydrosilylation of olefins with triethoxysilane
-
A novel fumed silica-supported bidentate nitrogen platinum complex was conveniently prepared from N-(2-aminoethyl)-3-aminopropyltriethoxysilane via immobilization on fumed silica followed by a reaction with hexachloroplatinic acid. The title complex was systematically characterized and analyzed by Fourier Transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and specific surface area analysis (BET). The resulting title complex was found to be efficient and stable in catalyzing the hydrosilylation reaction of olefins with triethoxysilane. Furthermore, the polymeric platinum complex could be separated by simple filtration and reused four times without any appreciable loss of catalytic activity.
- Li, Ji,Zhang, Lei,Li, Tingting,Yang, Chunhui
-
p. 728 - 733
(2016/05/09)
-
- Hydrosilylation of alkenes catalyzed by rhodium with polyethylene glycol-based ionic liquids as ligands
-
A series of polyethylene glycol-functionalized imidazolium ionic liquids has been prepared and characterized. These ionic liquids have been successfully applied in the hydrosilylation of alkenes catalyzed by rhodium complexes. The effects of the length of the polyether chain, the amount of ionic liquid, and the reaction temperature on the catalytic performance of hydrosilylation have been investigated. Furthermore, the catalytic system has been tested for the hydrosilylation of different alkenes with triethoxysilane. The new catalytic system exhibits both excellent catalytic activity and selectivity under low-temperature conditions. The catalyst system could be recycled five times with slightly deactivation.
- Xu, Yisong,Bai, Ying,Peng, Jiajian,Li, Jiayun,Xiao, Wenjun,Lai, Guoqiao
-
-
- Study on the anti-sulfur-poisoning characteristics of platinum-acetylide- phosphine complexes as catalysts for hydrosilylation reactions
-
A series of platinum-acetylide-phosphine complexes were synthesized and their anti-sulfur-poisoning characteristics investigated. In comparison with Speier's and Karstedt's catalysts, the platinum-acetylide-phosphine complexes exhibited both higher catalytic activity and selectivity for the β-adduct for the hydrosilylation reactions under the same conditions. Furthermore, the complexes also exhibited a strong ability to resist to sulfur-poisoning. This indicated that the alkyne ligands containing the silyl group had a strong impact on the hydrosilylation reaction. Copyright
- Li, Jiayun,Niu, Congbai,Peng, Jiajian,Deng, Yuan,Zhang, Guodong,Bai, Ying,Ma, Chao,Xiao, Wenjun,Lai, Guoqiao
-
p. 454 - 460
(2014/06/09)
-
- Effect of triarylphosphane ligands on the rhodium-catalyzed hydrosilylation of alkene
-
A series of triarylphosphanes (1a, 2a, 3a, 4a, 5a, 6a, 7a, 8a, 9a, 10a, 11a) have been synthesized. An X-ray crystal structure analysis of (2-bromophenyl)diphenylphosphane (1a) unambiguously confirmed the constitution of the functionalized phosphane. The hydrosilylation reaction of styrene with triethoxysilane catalyzed with RhCl3/triarylphosphane was studied. In comparison with the classic Wilkinson's catalyst, rhodium complexes with functionalized triarylphosphane ligands are characterized by a very high catalytic effectiveness for the hydrosilylation of alkene. Among these catalysts tested, RhCl3/diphenyl(2-(trimethylsilyl)phenyl)phosphane (8a) exhibited excellent catalytic properties. Using this silicon-containing phosphane ligand for the rhodium-catalyzed hydrosilylation of styrene, both higher conversion of alkene and higher β-adduct selectivity were obtained than with Wilkinson's catalyst.
- Xue, Mei,Li, Jiayun,Peng, Jiajian,Bai, Ying,Zhang, Guodong,Xiao, Wenjun,Lai, Guoqiao
-
p. 120 - 126
(2014/02/14)
-
- Effect of carboxyl-functionalized imidazolium salts on the rhodium-catalyzed hydrosilylation of alkene
-
A series of carboxyl-functionalized imidazolium salts were synthesized. Hydrosilylation reaction of carboxyl-functionalized imidazolium salts (1b-4b, 1c-3c) exhibited higher levels of styrene conversion and higher levels of β-adduct selectivity. In particular, no ethylbenzene as hydrogenation product could be yielded at all when Rh(PPh3)3Cl/carboxyl- functionalized imidazolium inner salts (1c-3c), respectively, were used as the catalyst. The Rh(PPh3)3Cl/carboxyl-functionalized imidazolium salts catalyst system can be reused without noticeable loss of catalytic activity.
- Ma, Chao,Li, Jiayun,Peng, Jiajian,Bai, Ying,Zhang, Guodong,Xiao, Wenjun,Lai, Guoqiao
-
-
- MCM-41-immobilised bidentate nitrogen platinum complex: A highly efficient and recyclable phosphine-free catalytic system for the hydrosilylation of olefins
-
An MCM-41-immobilised bidentate nitrogen platinum complex (MCM-41-2N-Pt) was very conveniently synthesised from commercially available and cheap 3-(2-aminoethylamino)propyltrimethoxysilane by immobilisation on the mesoporous silica nanoparticles, MCM-41, followed by reaction with potassium chloroplatinite. It was found that the MCM-41-2N-Pt complex is a highly efficient catalyst for the hydrosilylation of olefins with triethoxysilane and can be easily recovered and reused several times without significant loss of activity.
- Zhang, Hean,Liu, Jiaqin,Cheng, Shaojuan,Cai, Mingzhong
-
experimental part
p. 241 - 243
(2012/09/08)
-
- A novel fumed silica-supported nitrogenous platinum complex as a highly efficient catalyst for the hydrosilylation of olefins with triethoxysilane
-
A novel fumed silica-supported nitrogenous platinum complex was conveniently prepared from cheap γ-aminopropyltriethoxysilane via immobilization on fumed silica in toluene, followed by a reaction with hexachloroplatinic acid. The title complex was characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). It was found that the complex is an efficient and stable catalyst for the hydrosilylation of olefins with triethoxysilane. The title platinum complex could be separated by simple filtration and reused several times without any appreciable loss in the catalytic activity. Crown Copyright
- Li, Ji,Yang, Chunhui,Zhang, Lei,Ma, Tianlong
-
experimental part
p. 1845 - 1849
(2011/06/19)
-
- Synthesis of rhodium N-heterocyclic carbene complexes and their catalytic activity in the hydrosilylation of alkenes in ionic liquid medium
-
Rhodium complexes bearing N-heterocyclic carbene (NHC) ligands were prepared from bis(η4-1,5-cyclooctadiene) dichlorodirhodium and 1-alkyl-3-methylimidazolium-2-carboxylate, and the catalytic properties of rhodium complexes prepared in the hydrosilylation of alkenes in ionic liquid media were investigated. It was found that both the catalytic activity and selectivity of the rhodium complexes bearing NHC ligands were influenced by the attached substituents of the imidazolium cation. Additionally, rhodium complexes bearing NHC ligands in ionic liquid BMimPF6 could be reused without noticeable loss of catalytic activity and selectivity.
- Li, Jiayun,Peng, Jiajian,Bai, Ying,Lai, Guoqiao,Li, Xiaonian
-
experimental part
p. 2116 - 2121
(2011/06/22)
-
- MCM-41-supported bidentate phosphine rhodium complex: An efficient and recyclable heterogeneous catalyst for the hydrosilylation of olefins
-
MCM-41-supported bidentate phosphine rhodium complex (MCM-41-2P-RhCl 3) was conveniently synthesized from commercially available and cheapγ-aminopropyltriethoxysilane via immobilization on MCM-41, followed by reacting with diphenylphosphinomethanol and rhodium chloride. It was found that the title complex is a highly efficient catalyst for the hydrosilylation of olefins with triethoxysilane and can be recovered and recycled by a simple filtration of the reaction solution and used for at least 10 consecutive trials without any decreases in activity.
- Hu, Ronghua,Hao, Wenyan,Cai, Mingzhong
-
experimental part
p. 1629 - 1634
(2012/01/13)
-
- Rh(pph3)3cl/tetrakis(dialkylamino)phosphonium salts as thermoregulated and recyclable catalytic system for hydrosilylation reaction
-
Eleven tetrakis(dialkylamino)phosphonium salts have been prepared and were used as "soft" catalyst supports for the hydrosilylation reaction of styrene with triethoxysilane catalyzed by Rh(PPh3)3Cl. Among the Rh(PPh3)3Cl/tetrakis(dialkylamino)phosphonium salts tested, the best catalytic activity and selectivity in favor of the β-adduct were obtained when {[(C4H9) 2N]3[(C8H17)2N]P}PF 6 was used as the support, and Rh(PPh3)3Cl/ {[(C4H9)2N]3[(C8H 17)2N]P}PF6 catalyst system can be reused more than 10 times without noticeable loss of catalytic activity and selectivity. Copyright Taylor & Francis Group, LLC.
- Wang, Diliang,Li, Jiayun,Peng, Jiajian,Bai, Ying,Lai, Guoqiao
-
experimental part
p. 2258 - 2266
(2012/03/27)
-
- A diphosphino-functionalised MCM-41-anchored platinum complex: An efficient and reusable catalyst for the hydrosilylation of olefins
-
A diphosphino-functionalised MCM-41 anchored platinum complex (MCM-41-2P-Pt) was conveniently synthesised from commercially available and cheap γ-aminopropyltriethoxysilane via immobilisation on MCM-41, followed by reactiopn with diphenylphosphinomethanol and potassium chloroplatinite. It was found that the title complex is a highly efficient catalyst for the hydrosilylation of olefins with triethoxysilane and can be recovered and recycled by a simple filtration of the reaction solution and used for at least 10 consecutive reactionss without any decrease in activity.
- Zha, Lingfang,Hao, Wenyan,Cai, Mingzhong
-
experimental part
p. 648 - 652
(2011/03/18)
-
- Hydrosilylation catalysed by a rhodium complex in a supercritical CO 2/ionic liquid system
-
The hydrosilylation of alkenes in a supercritical CO2 (scCO 2)/ionic liquid (IL) system was investigated. Rh(PPh 3)3Cl exhibited excellent catalytic activity and selectivity. KOtBu was used as an additive, and no hydrogenation by-product (alkane) was detected in the scCO2/IL system. During hydrosilylation in the scCO2/IL system, the reactants were possibly transferred into the IL phase by scCO2, in which the catalyst was dissolved. The products can be flushed with scCO2 after the reaction and the catalyst/IL system reused.
- Li, Jiayun,Peng, Jiajian,Zhang, Guodong,Bai, Ying,Lai, Guoqiao,Li, Xiaonian
-
experimental part
p. 1330 - 1334
(2010/09/17)
-
- Hydrosilylation of olefins over rhodium complex anchored over thioether-functionalized MCM-41
-
The hydrosilylation of alkenes with triethoxysilane has been achieved at 120 °C in the presence of 0.01. mol% of thioether-functionalized MCM-41 anchored rhodium complex, affording the corresponding addition products in 68-91% yields. This supported rhodium complex can be reused several times without noticeable loss of activity. Our system not only solves the basic problems of catalyst separation and recovery, but also avoids the use of phosphine ligands.
- Zha, Lig Fang,Yang, Wei Sen,Hao, Wen Yan,Cai, Ming Zhong
-
experimental part
p. 1310 - 1313
(2011/10/09)
-
- METHOD FOR EXTENDING LONG-TERM ELECTRICAL POWER CABLE PERFORMANCE
-
An improved method for imparting excellent long-term dielectric performance to an in-service electrical cable section having a stranded conductor surrounded by a conductor shield encased in a polymeric insulation and having an interstitial void volume in the region of the conductor, the cable section having an average operating temperature T. The method comprising injecting a dielectric enhancement fluid composition into the interstitial void volume, the composition comprising at least one component selected from: (1) a water-reactive material selected from an organosilane monomer, the above organosilane monomer wherein at least one of the water-reactive groups has been substituted with a condensable silanol group, an oligomer of the above organosilane monomer, or a co-oligomer of the above organosilane monomer, the organosilane monomer having a diffusion coefficient at least about 15 times greater than the diffusion coefficient of its corresponding tetramer;(2) a water-reactive material similar to (1) having at least one group attached to silicon comprising 7 to about 20 —CH2— units;(3) a non-water-reactive organic material which has a diffusion coefficient of less than about 10?9 cm2/sec and an equilibrium concentration of at least about 0.005 gm/cm3 in the polymeric insulation, the above mentioned diffusion coefficients and equilibrium concentration being determined at temperature T; or(4) an organic compound having an equilibrium concentration in the polymeric insulation at 55° C. which is less than 2.25 times the equilibrium concentration at 22° C.
- -
-
-