Silanes tetramethoxysilane

A different example of triphasic catalysis for the Heck, Stille and Suzuki reactions relied on a three-phase microemulsion/sol-gel transport system. Gelation of an z-octyl(triethoxy)silane, tetramethoxysilane and Pd(OAc)2 mixture in a H2O/CH2CI2 system led to a hydrophobicitized sol-gel matrix that entrapped a phosphine-free Pd(ii) precatalyst. The immobilized precatalyst was added to a preformed microemulsion obtained by mixing the hydrophobic components of a cross coupling reaction with water, sodium dodecyl sulfate and a co-surfactant, typically zz-propanol or butanol. This immobilized palladium catalyst was leach proof and easily recyclable. 

Tetra-n-butoxysilane Tetrakis (2-ethoxyethoxy) silane Tetrakis (2-methoxyethoxy) silane Tetramethoxysilane 1,1,3,3-Tetramethyldisiloxane Tetramethylsilane Tetra-n-propoxysilane Trichlorosilane Triethoxysilane N-[3-(Triethoxysilyl)-propyl] 4,5-dihydroimidazole N-(Triethoxysilylpropyl) urea Triethylchlorosilane Triethylsilane 1-Trimethoxysilyl-2-(chloromethyl) phenylethane ... 

Stannous octoate Stearamide MEA Stearyl methacrylate 3-(N-Styrylmethyl-2-aminoethylamino) propyltrimethoxysilane hydrochloride Sucrose distearate Sulfated neatsfoot oil Sulfated olive oil Synthetic wax Talc Tall oil Tallowamide DEA Tallowamine acetate Tetra-n-butoxysilane Tetrakis (2-ethoxyethoxy) silane Tetrakis (2-methoxyethoxy) silane Tetramethoxysilane 2,2,4,4-TetramethyM, 3-cyclobutanediol 1,1,4,4-Tetramethyldichlorodisilethylene 1,1,3,3-Tetramethyldisiloxane Tetramethylsilane Tetramethylthiuram disulfide Tetra-n-propoxysilane Tributoxyethyl phosphate Tributyl phosphate Trichlorosilane Triethoxysilane N-[3-(Triethoxysilyl)-propyll 4,5-dihydroimidazole N-(Triethoxysilylpropyl) urea Triethylchlorosilane Triethyl phosphate Triethylsilane Trilauryl trithiophosphite Trilinoleic acid 1-Trimethoxysilyl-2-(chloromethyl) phenylethane Trimethoxysilylpropyidiethylene triamine N-Trimethoxysilylpropyl-N,N,N-trimethyl ammonium chloride Trimethylethoxysilane 2,6,8-Trimethylnonyl-4-alcohol Trimethylolpropane tricocoate 2,2,4-Tri methyl-1,3-pentanediol Trimethylsilyl acetamide o-Trimethylsilyl acetate Trimethylsilyl imidazole Trimethylsilyl iodide Trimethylsilyinitrile Trimethylsilyl trifluoromethane sulfonate Vermiculite Vinyidimethylchlorosilane ... 

During the preparation of the hexamethoxides of rhenium, molybdenum and tungsten by co-condensation with excess tetramethoxysilane on a cold surface, simultaneous co-condensation is necessary to avoid the danger of explosion present when sequential condensation of the reactants is employed. In the latter case, the high concentrations of hexafluoride at the interface leads to violent reaction with the silane. 

Almost at the same time (1996), Tanaka and co-workers [33] and Fields [34] expanded the research field of continuous polymer support by the introduction of (derivatized) inorganic silica rods, which were prepared by sol-gel process of silane precursors [tetramethoxysilane (TMOS) or dimethyloctadecylchlorosilane (ODS)] in the presence of poly(ethylene oxide) (PEO) as porogen. 

The hydrotalcite-1ike material catalyzes organic reactions in which the interlayer Cl" anions play the role of catalyst. The material catalyzed the halide-exchange reactions between benzyl chloride with butyl bromide or butyl iodide in toluene. The hydrota1cite-1ike material also catalyzes a disproportionation of trimethoxysilane to give silane and tetramethoxysilane. 

AI3-11596 EINECS 211-656-4 HSDB 5511 Methyl orthosilicate Methyl silicate ((CH3)4Si04) Methyl silicate, ((MeO)4Si) Methyl silicate 28 Methyl silicate 39 MSP 150 NSC 67383 Silane, tetramethoxy- Silicic acid (H4SI04), tetramethyl ester Silicic acid, methyl ester of ortho- Silicic acid, tetramethyl ester SIT 7510.0 Tetra-methyl orfhosilioale Tetramethoxysilane Tetramethyl-silikat TL 190 TMOS TSL 8114 UN2606. Liquid mp = -1.0 bp = 121 d = 1.0232 very soluble in EtOH. 

In the experiments on the gelation of solutions of tetramethoxysilane, tetraethoxysilane, tetraisopropoxy-silane, and tetra- -butoxysilane, in which solutions with H20/alkoxide = 1.5, HCl/alkoxide = 0.40, and [alkoxide] = 2 mol/1 with CH3OH as solvent were kept at 40°C in air-sealed flasks, an opaque gel formed only from the TMOS solution, whereas no gelation took place in the solutions of the other alkoxides [7]. 

Silicic acid, tetrakis (2-ethylhexyl) ester. See Tetrakis (2-ethylhexoxy) silane Silicic acid, tetrakis (2-methoxyethyl) ester. See Tetrakis (2-methoxyethoxy) silane Silicic acid, tetramethyl ester. See Tetramethoxysilane... 

The isoelectronic analogs 7 and 8 were prepared by treatment of tetramethoxysilane with 2-methyllactic acid and the corresponding aminoalcohol (molar ratio 1 2 1) in boiling acetonitrile (removal of the methanol formed by distillation) (Scheme 2). Alternatively, compounds 7 and 8 were obtained by reaction of tetrakis(dimethylamino)silane with two molar equivalents of 2-methyllactic acid and one molar equivalent of the respective aminoalcohol in boiling acetonitrile (Scheme 2). 

Model reactions of epoxypropane and epoxyhexane were analysed using Fourier Transform-Raman spectroscopy and Carbon-13 NMR spectroscopy to obtain information on the possible products of ring opening in epoxy silane-based sol-gel derived hybrid polymers. A mixture of epoxyalkane, tetramethoxysilane and aluminium sec-butylate was employed to investigate behaviour during the sol-gel process. Raman band and NMR peak assignments for various reaction products are presented and discussed. 24 refs. 

Cyclic siliconides are analogous to acetonides in structure, and can most readily be made with dichlorodimethyl-silane (DMCS) in pyridine [35,36], Cyclic siliconide derivatives of steroids can similarly be made by reacting the dihydroxyacetone side chain of, e.g., cortisone, cortisol or betamethasone with dimethyldiacetoxysilane (DMDAS) and triethylamine [37] as shown in Figure 5. Other reagents for preparing cyclic siliconides include tetramethoxysilane and triethoxysilane [38]. 

Inorganic-organic hybrid silica was prepared via co-condensation of tetraethoxy- or tetramethoxysilane (TEOS or TMOS) and aminoalkoxysilane with appropriate amounts of ethanol (or methanol), water, and ammonia. The amine functional groups in the silica were converted to N-diazeniumdiolate NO donors via exposure to high pressures of NO (5 atm) under basic conditions. Control over both the structure and concentration of the silane precursors (i.e., tetraalkoxy-and aminoalkoxysilanes) and specific synthetic conditions allowed for the preparation of NO donor silica particles of widely varying sizes (20-500 nm), NO payloads (50-1,780 nmol/mg), maximum amounts of NO released (10-5,500 ppb/mg), half-lives (0.1-12 h), and NO release durations (up to 30 h)... 

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