- PROCESS FOR SYNTHESIS OF ORGANOSILICON COMPOUNDS FROM HALOSILANES
-
A process for synthesis of an organosilicon compound is provided herein. Also, novel organosilicon compounds prepared by the present process is provided herein. The process comprises the reaction of a halosilane with an organofunctional alkyl halide in the presence of a metal catalyst, a promoter, and an optional co-catalyst. The process provides an efficient synthetic route to produce organosilicon compounds. The process also allows synthesis of organosilicon compounds with a plurality of different functional groups.
- -
-
Paragraph 0150-0151
(2022/02/09)
-
- 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)
-
- Method for preparing hydroxyalkyl disiloxane
-
The invention relates to a method for preparing hydroxyalkyl disiloxane. The method includes the following steps: (1) mixing carboxylic acid unsaturated ester with dimethylchlorosilane in an organic solvent, introducing inert gas, adding hydrosilyation catalyst and stirring for 2 to 12 hours; (2) dropwising a mixed liquid of acidic aqueous solution and the organic solvent to the hydrosilylation reaction product and hydrolyzing for 1 to 6 hours; (3) regulating the hydrolysis product pH to be neutral, extracting organic layers three times with extraction agent, washing three times, drying for 24 hours and removing the extraction agent by rotary evaporating to obtain the finished product. The method has the advantages of simple operation, simple steps, mild reaction conditions, pure product and high yield, and the yield of the hydrosilylation reaction product can reach 83.2% and the yield of the hydrolysis product can reach 89.5%.
- -
-
Paragraph 0049; 0050; 0051; 0052; 0053; 0054; 0087
(2017/07/22)
-
- Surface functionalization of silica by Si-H activation of hydrosilanes
-
Inspired by homogeneous borane catalysts that promote Si-H bond activation, we herein describe an innovative method for surface modification of silica using hydrosilanes as the modification precursor and tris(pentafluorophenyl) borane (B(C6F5)3) as the catalyst. Since the surface modification reaction between surface silanol and hydrosilane is dehydrogenative, progress and termination of the reaction can easily be confirmed by the naked eye. This new metal-free process can be performed at room temperature and requires less than 5 min to complete. Hydrosilanes bearing a range of functional groups, including alcohols and carboxylic acids, have been immobilized by this method. An excellent preservation of delicate functional groups, which are otherwise decomposed in other methods, makes this methodology appealing for versatile applications.
- Moitra, Nirmalya,Ichii, Shun,Kamei, Toshiyuki,Kanamori, Kazuyoshi,Zhu, Yang,Takeda, Kazuyuki,Nakanishi, Kazuki,Shimada, Toyoshi
-
supporting information
p. 11570 - 11573
(2014/10/15)
-
- Mechanistic insights into the hydrosilylation of allyl compounds - Evidence for different coexisting reaction pathways
-
The hydrosilylation of allyl compounds is often accompanied by the formation of high amounts of byproducts. The formation processes have not been fully understood so far. In this work, the allyl hydrosilylation mechanism is investigated in detail and experimental and theoretical evidence for multiple, coexisting reaction pathways is provided. Based on earlier reports and the observations during an extensive catalytic study, different pathways, leading to the observed byproducts, were identified and proven by labeling experiments and DFT calculations. Oxidative addition of the silane and the insertion of the allyl compound into the Pt-H bond turned out to be the crucial, selectivity-determining steps within the catalytic cycle. Based on these findings, it should be possible to systematically influence these steps and pave the way to a rational and straightforward design of more selective catalysts.
- Gigler, Peter,Drees, Markus,Riener, Korbinian,Bechlars, Bettina,Herrmann, Wolfgang A.,Kuehn, Fritz E.
-
-