- Recyclable Transition Metal Catalysis using Bipyridine-Functionalized SBA-15 by Co-condensation of Methallylsilane with TEOS
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Well-defined recyclable Pd- and Rh-bipyridyl group-impregnated SBA-15 catalysts were prepared for C?C bond coupling reaction and selective hydrogenation reactions, respectively. These SBA-15 derived ligands for the catalysts were prepared by direct and indirect co-condensation method using bipyridyl-linked methallylsilane. This indirect method, involving methoxysilane generated from methallylsilane shows higher loading efficiency of transition metal catalysts on SBA-15 than the direct use of methallylsilane.
- Han, Ye Ri,Kim, Jae Soon,Park, Woo-Jin,Lee, Chang-Hee,Cheon, Jinwoo,Jun, Chul-Ho
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supporting information
p. 197 - 201
(2021/01/18)
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- PROCESS FOR THE PREPARATION OF HALOALKYLALKOXYSILANCS AND HALOALKYLHALOSILANES
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This invention involves a process for the preparation of haloalkylalkoxysilanes and haloalkylhalosilancs. The process comprises reacting an alkoxyhydridosilane or a halohydridosilanc silane with an alkenylhalide compound in the presence of a catalytic amount of an iridium containing catalyst. When a halohydridosilane is the silane rcactant. the resulting haloalkylhalosilane may be alkoxylatcd by reaction with a C1-C6, alcohol, In another aspect of the invention, the reacting is conducted under a reduced oκygen atmosphere to improve the catalyst activity and the yield of the resulting haloalkylhalosilane or halυalkylalkυx vsi lane.
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Page/Page column 20
(2009/10/22)
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- Process for preparing low-chloride or chloride-free alkoxysilanes
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A process for preparing an alkoxysilane with an acidic chloride content of less than 10 ppm by weight, comprising: reacting a chlorosilane with an alcohol in a water-free and solvent-free phase to form a product mixture containing alkoxysilane and residual acidic chloride, with removal of resultant hydrogen chloride from the product mixture, then adding liquid or gaseous ammonia, in an amount corresponding to a stoichiometric excess, based on the content of acidic chloride, to form an ammonia-containing product mixture, treating the ammonia-containing product mixture at a temperature between 10 and 50 DEG C., wherein the ammonia and acidic chloride undergo neutralization, to form a crude product, and optionally, then separating off a salt formed in the course of neutralization, from the crude product, and recovering the alkoxysilane by distilling the crude product.
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- Method for making compounds containing hydrocarbonoxysilyi groups by hydrosilylation using hydrido (hydrocarbonoxy) silane compounds
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A method for preparing compounds containing (hydrocarbonoxy)silyl groups by reacting an unsaturated organic compound with a hydrido (hydrocarbonoxy)silane compounds by means of the catalytic action of platinum or a platinum compound in the presence of a c
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- Method and apparatus for preparing 3-[N-(2-aminoethyl)]aminopropylalkoxysilane
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The invention produces a 3-[N-(2-aminoethyl)]aminopropylalkoxysilane in high yields by reacting a 3-chloropropylalkoxysilane with ethylene diamine. A distillation pot is charged with ethylene diamine and heated above the boiling point of ethylene diamine for evaporating ethylene diamine, which is then condensed into a liquid. The liquid ethylene diamine is mixed for reaction with a 3-chloropropylalkoxysilane in such a proportion to give a molar ratio of ethylene diamine/3-chloropropylalkoxysilane of at least 12/1, thereby forming a 3-[N-(2-aminoethyl)]aminopropylalkoxysilane. The reaction solution is fed back to the pot where the unreacted ethylene diamine in the reaction solution is evaporated again and then condensed for use in a next cycle of reaction. The apparatus includes a distillation pot, a reflux condenser, a feed means and a reactor connected to form a recirculating system.
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- Pyridinium salts containing alkoxysilyl groups
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Pyridinium salts of the formula STR1 are prepared. The compounds are useful as phase transfer catalysts for the preparation of methacryloyloxyalkylalkoxysilanes and acryloyloxyalkylalkoxysilanes.
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- Packing for use in resolution
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The packing for use in resolution proposed for the liquid chromatography for particularly the opti-cal resolution of racemic compounds is prepared by reacting a silica gel carrier with a so-called silane treating agent to introduce a spacer part therein and chemically bonding it with a copper salt of a carboxylic or thiocarboxylic acid selected from the group consisting of optically active D- and L-2--acetizinecaroxylic acid, proline, hydroxyproline and allohydroxyproline. The steric bulkiness, the distance between the silica gel and the optically active group and the degree of hydrophobicity are specified so as to obtain an excellent resolving power.
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