- An alternate route for the synthesis of hybrid mesoporous organosilica with crystal-like pore walls from allylorganosilane precursors
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The bridged allylorganosilanes 1,4-bis(diallylethoxysilyl)benzene and 1,4-bis(triallylsilyl)benzene are presented as new precursors for the surfactant-assisted synthesis of ordered mesoporous organosilica with pore walls having crystal-like molecular-scal
- Kapoor, Mahendra P.,Inagaki, Shinji,Ikeda, Shushiro,Kakiuchi, Kiyomi,Suda, Masahiko,Shimada, Toyoshi
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- Mechanical and Hydrothermal Stabilities of Aged Periodic Mesoporous Organosilicas
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Methylene-, ethylene-, and phenylene-bridged periodic mesoporous organosilicas (PMOs) synthesized with nonionic alkylethylene oxide templates exhibited significantly better mechanical and hydrothermal stabilities than periodic mesoporous silica. Synthesis
- Burleigh, Mark C.,Markowitz, Michael A.,Jayasundera, Shalini,Spector, Mark S.,Thomas, Chris W.,Gaber, Bruce P.
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- Meerwein's reagent mediated, significantly enhanced nucleophilic fluorination on alkoxysilanes
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We developed a new facile method to fluorosilanes from alkoxysilanes using Meerwein's reagent. Our protocol afforded fluorosilanes in excellent yields in various organic solvents including acetonitrile under mild reaction conditions at room temperature. We also proposed a reaction mechanism with the probable silyloxonium intermediates. Georg Thieme Verlag Stuttgart · New York.
- Jorapur, Yogesh R.,Shimada, Toyoshi
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supporting information; experimental part
p. 1064 - 1068
(2012/06/17)
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- A facile and efficient synthesis of aryltriethoxysilanes via sonochemical Barbier-type reaction
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A series of aryltriethoxysilanes was synthesized from the reaction mixture of aryl bromide, Mg powder, 1,2-dibromoethane and tetraethyl orthosilicate in THF under ultrasound. This sonochemical Barbier-type reaction provides a simple and efficient method for preparation of aryltriethoxysilanes. The Hiyama cross-coupling reaction of phenyltriethoxysilane with bromobenzene was investigated under different palladium catalysts and Pd(PhCN)2Cl2 was found to be the best choice.
- Lee, Adam Shih-Yuan,Chang, Yu-Ting,Chu, Shu-Fang,Tsao, Kuo-Wei
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p. 7085 - 7087
(2007/10/03)
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- Hybrid organic-inorganic adsorbents
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The present invention relates generally to hybrid organic-inorganic adsorbents for decontamination of fluids. Bridged poysilsesquioxanes are a family of hybrid organic-inorganic materials prepared by sol-gel processing of monomers that contain a variable organic bridging group and two or more trifunctional silyl groups. Specifically, the present invention relates to dipropylenedisulfide-co-phenylene-bridged polysilsesquioxane compositions, methods of making dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes, and methods of use of dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes. The present invention discloses properties of dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes that include high ligand loading, increased surface area, and increased porosity. These properties make dipropylenedisulfide-co-phenylene-bridged polysilsesquioxanes excellent adsorbents for decontamination of fluids for use in environmental and industrial processes.
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- Acid functionalized organically-bridged polysilsesquioxanes as catalysts for acid catalyzed reactions
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A process of effecting an acid catalyzed reaction wherein a reactant capable of undergoing an acid catalyzed reaction is contacted with an acid functionalized organically-bridged polysilsesquioxane catalyst where all of the acid functionality is covalently bonded to the organic portion of an organically-bridged polysilsesquioxane framework has been developed. The acid functionalized organically-bridged polysilsesquioxane is formed by polymerizing a monomer through sol-gel processing to form an organically-bridged polysilsesquioxane, reacting an acid group onto the organic portion of the organically-bridged polysilsesquioxane, and recovering the acid functionalized product. An embodiment of the invention is where the acid catalyzed reaction is the hydration of olefins, alkylation, acylation, isomerization, or aldol condensation/elimination. A specific embodiment of the invention is effecting the aldol condensation/elimination reaction of acetone with itself to form mesityl oxide by contacting the acetone with an effective amount of sulfonated phenylene-bridged polysilsesquioxane.
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- Arylsilsesquioxane Gels and Related Materials. New Hybrids of Organic and Inorganic Networks
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Molecular building blocks for the preparation of amorphous hybrid organic-inorganic network materials have been synthesized. Hydrolysis and condensation of bis(triethoxysilyl)aryl 1-4 and -ethynyl 5 monomers results in formation of aryland ethynyl-bridged polysilsequkwanes in the form of xerogels. The gels were glasslike materials composed of uniform aggregates of particles between 50 and 80 nm in diameter. Atomic force microscopy was used to examine the fine grained aggregate characteristics of phenyl-bridged polysilsesquioxanes. The aryl-bridged materials were microporous with surface areas as high as 1000 m2/g and thermally stable to 400 °C in air. Solid state 13C and 29Si NMR spectroscopies were used evaluate the integrity of the aryl and ethynyl bridges and to determine the degrees of hydrolysis (semiquantitative) and condensation in the network materials.
- Shea,Loy,Webster
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p. 6700 - 6710
(2007/10/02)
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