- Stable silanetriols that contain tert-alkoxy groups: Versatile precursors of siloxane-based nanomaterials
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Novel tert-alkoxysilanetriols (ROSi(OH)3, R = adamantyl and 3-ethyl-3-pentyl) have been prepared from the corresponding tert- alkoxytrichlorosilanes and successfully used as molecular building blocks to produce ordered siloxane-based nanomateri
- Suzuki, Jumpei,Shimojima, Atsushi,Fujimoto, Yasuhiro,Kuroda, Kazuyuki
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- Hierarchically porous monolithic silica with varying porosity using bis(trimethoxysilyl)arenes as precursors
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The ortho-, meta- and para-isomers of bis(trimethoxysilyl)benzene and bis((trimethoxysilyl)phenyl)dimethoxysilane were synthesized from their corresponding diarylbromides. Mixtures of these bis(trimethoxysilyl)arenes and tetramethoxysilane (TMOS) were used as organosilica precursors for the preparation of macro-mesoporous silica monoliths using different amounts of the porogen poly(ethylene glycol) to investigate the effect on the porosity of the final materials. The prepared samples were characterized by nitrogen and dibromomethane sorption measurements, mercury intrusion porosimetry and scanning electron microscopy. The analysis of dibromomethane isotherms indicated a significantly lower polarity of the mesopore surface compared to that of pure SiO2 monoliths, proving the presence of arene units at the mesopore surfaces.
- Von Der Lehr, Martin,Ellinghaus, Rüdiger,Smarsly, Bernd M.
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- Molecularly designed nanoparticles by dispersion of self-assembled organosiloxane-based mesophases
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The design of siloxane-based nanoparticles is important for many applications. Here we show a novel approach to form core-shell silica nanoparticles of a few nanometers in size through the principle of dispersion of ordered mesostructures into single nanocomponents . Self-assembled siloxane-organic hybrids derived from amphiphilic alkyl-oligosiloxanes were postsynthetically dispersed in organic solvent to yield uniform nanoparticles consisting of dense lipophilic shells and hydrophilic siloxane cores. Insitu encapsulation of fluorescent dyes into the nanoparticles demonstrated their ability to function as nanocarriers. Self-assembled hybrid nanoparticles: A new type of oligosiloxane precursor self-assembles into reverse-micellar mesostructures, which can be transformed to nanoparticles with a siloxane core and an organic shell by dispersion in nonpolar organic solvents.
- Sakamoto, Shigeru,Tamura, Yasuhiro,Hata, Hideo,Shimojima, Atsushi,Kuroda, Kazuyuki,Sakamoto, Yasuhiro
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- ORGANOMETALLIC COMPOUND AND METHOD
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A class of organometallic compounds is provided. The compounds correspond in structure to Formula 1 (A)x-M-(OR3)4-x wherein: A is selected from the group consisting of -NR1R2, -N(R4)(CH2)nN(R5R6), -N=C(NR4R5)(NR6R7), OCOR1, halo and Y; R1 and R2 are independently selected from the group consisting of H and a cyclic or acyclic alkyl group having from 1 to 8 carbon atoms, with the proviso that at least one of R1 and R2 must be other than H; R4, R5, R6 and R7 are independently selected from the group consisting of H and an acyclic alkyl group having from 1 to 4 carbon atoms; Y is selected from the group consisting of a 3- to 13-membered heterocyclic radical containing at least one nitrogen atom; R3 is a cyclic or acyclic alkyl group having from 1 to 6 carbon atoms; M is selected from the group consisting of Si, Ge, Sn, Ti, Zr and Hf; x is an integer from 1 to 3; and n is an integer from 1 to 4. Compounds of the invention may be useful as precursors in chemical phase deposition processes such as atomic layer deposition (ALD), chemical vapour deposition (CVD), plasma assisted ALD and plasma assisted CVD. Methods of low temperature vapour phase deposition of metal oxide films, such as SiO2 films, are also provided.
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Page/Page column 9; 10
(2017/09/05)
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- FLUORINE-CONTAINING SILOXANE COMPOUND, METHOD FOR PRODUCING THE SAME, COATING AGENT COMPRISING THE SAME, AND SURFACE TREATMENT METHOD FOR GLASS BASE MATERIAL
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PROBLEM TO BE SOLVED: To provide a fluorine-containing siloxane compound that can impart water repellent and antifouling properties to the surface of a base material, and allows distillation purification and can be produced conveniently, and provide a coating agent comprising the same. SOLUTION: The present invention provides a fluorine-containing siloxane compound produced by making a dihydroxy siloxane compound react with a fluoroalkyl-substituted silane compound, then a silane compound having a reactive group, and a coating agent comprising the fluorine-containing siloxane compound and a liquid medium. SELECTED DRAWING: None COPYRIGHT: (C)2017,JPOandINPIT
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Paragraph 0067-0069
(2017/09/21)
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- ALTERNATIVE METHODS FOR THE SYNTHESIS OF ORGANOSILICON COMPOUND
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A method of forming chloro-substituted silanes from the reaction of an alkoxysilane with a chlorinating agent in the optional presence of a catalyst is provided. More specifically, chloro-substituted silanes, including but not limited to silicon tetrachloride, are formed by reacting a chlorinating agent, such as thionyl chloride, with an alkylalkoxysilane having the formula (R'0)4-xSiRx, where R and R' are independently selected alkyl groups comprising one or more carbon atoms and x is 0, 1, 2, or 3. The catalyst may be dimethylformamide, (chloromethylene)dimethyliminium chloride, or triethylamine, among others. The chloro- substituted silane formed in the reaction along with several by-products has the formula (RO)4-x-ySiRxCly; where x is 0, 1, 2, or 3 and y is 1, 2, 3, or 4. One of the by-products of the reaction is an alkyl chloride.
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Paragraph 0077-0082
(2013/09/26)
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- Alternative methods for the synthesis of organosilicon compounds
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A method of forming chloro-substituted silanes from the reaction of an alkoxy-or acetoxy-substituted silane with a chlorinating agent in the optional presence of a catalyst is provided. For instance, chloro-substituted silanes, including but not limited to silicon tetrachloride, are formed by reacting a chlorinating agent, such as thionyl chloride, with an alkoxysilane having the formula (R'O)4-xSiRx, where R and R' are independently selected alkyl groups comprising one or more carbon atoms and x is 0, 1, 2, or 3. The catalyst may be dimethylformamide, (chloromethylene)dimethyliminium chloride, or triethylamine, among others. The chloro-substituted silane formed in the reaction along with several by-products has the formula (R'O)4-x-ySiRxCly; where x is 0, 1, 2, or 3 and y is 1, 2, 3, or 4. One of the by-products of the reaction is an alkyl chloride.
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Paragraph 0025; 0053-0055
(2013/09/26)
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- METHOD OF PRODUCING A HYDROLYZABLE SILICON-CONTAINING COMPOUND
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The present invention provides a safe, inexpensive, and high yield means of producing a hydrolyzable silicon-containing compound, e.g., an organooxysilane and the like. A compound (A) represented by the general formula R1-O-R2 wherein R1 represents a C4-30, substituted or unsubstituted, tertiary alkyl group or aralkyl group and R2 represents a C1-30, substituted or unsubstituted, monovalent hydrocarbyl group or acyl group, is reacted in the presence of a Lewis acid catalyst with a halosilane (B) represented by the general formula R3mSiX4-m wherein R3 represents the hydrogen atom or a C1-30 substituted or unsubstituted monovalent hydrocarbyl group, X is independently bromine or chlorine, and m represents an integer from 0 to 3.
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Page/Page column 17; 20
(2012/07/14)
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- Practical conversion of chlorosilanes into alkoxysilanes without generating HCl
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Alcohol-free: A versatile, efficient, and practical synthesis of alkoxysilanes without generation of HCl involves the reaction of chlorosilanes with unsymmetrical ethers in the presence of a Lewis acid (see scheme). The reaction proceeds through selective cleavage of C-O bonds and is superior to conventional processes. Industrially feasible reagents are used and only one by-product results. Copyright
- Wakabayashi, Ryutaro,Sugiura, Yasushi,Shibue, Toshimichi,Kuroda, Kazuyuki
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supporting information; experimental part
p. 10708 - 10711
(2011/12/05)
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- Formation of organo-inorganic hybrid networks in the system consisting of Tris(2,2-bipyridine)ruthenium complexes and silica
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Organo-inorganic composites consisting of mutually linked ruthenium complexes with organic ligands and an inorganic SiO2 network were synthesized by the sol-gel method. The luminescence and photosensitive properties of the resulting compounds w
- Zdravkov,Aleksandrova,Aseev,Nikonorov,Khimich
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scheme or table
p. 1532 - 1537
(2009/05/06)
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- PROCESS FOR MAKING HALOORGANOALKOXYSILANES
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A haloorganoalkoxysilane is prepared by reacting an olefinic halide with an alkoxysilane in which the alkoxy group(s) contain at least two carbon atoms in a reaction medium to which has been added a catalytically effective amount of ruthenium-containing catalyst and a reaction-promoting effective amount of an electron-donating aromatic compound promoter. The process can be used to prepare, inter alia, chloropropyltriethoxysilane, which is a key intermediate in the manufacture of silane coupling agents.
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Page/Page column 11-12; 18
(2008/06/13)
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- Process for making haloorganoalkoxysilanes
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A haloorganoalkoxysilane is prepared by reacting an olefinic halide with an alkoxysilane in which the alkoxy group(s) contain at least two carbon atoms in a reaction medium to which has been added a catalytically effective amount of ruthenium-containing catalyst and a reaction-promoting effective amount of an electron-donating aromatic compound promoter. The process can be used to prepare, inter alia, chloropropyltriethoxysilane, which is a key intermediate in the manufacture of silane coupling agents.
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- Reaction of Tetraalkoxysilanes with Alkyl(aryl)chlorosilanes
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Alkyl(aryl)trichloro- or dialkyl(diaryl)dichlorosilanes react with tetraalkoxysilanes Si(OMe)4, Si(OEt)4, and Si(OBu)4 to give partially etherfied alkyl(aryl)chlorosilanes RSiCl2(OAlk), RSiCl(OAlk)2, and R2SiCl(OAlk).
- Chernyshev, E. A.,Komalenkova, N. G.,Tagachenkov, A. A.,Bykovchenko, V. G.
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p. 241 - 243
(2007/10/03)
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