- A General and Selective Synthesis of Methylmonochlorosilanes from Di-, Tri-, and Tetrachlorosilanes
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Direct catalytic transformation of chlorosilanes into organosilicon compounds remains challenging due to difficulty in cleaving the strong Si-Cl bond(s). We herein report the palladium-catalyzed cross-coupling reaction of chlorosilanes with organoaluminum reagents. A combination of [Pd(C3H5)Cl]2 and DavePhos ligand catalyzed the selective methylation of various dichlorosilanes 1, trichlorosilanes 5, and tetrachlorosilane 6 to give the corresponding monochlorosilanes.
- Naganawa, Yuki,Nakajima, Yumiko,Sakamoto, Kei
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supporting information
p. 601 - 606
(2021/01/13)
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- Waste-free and efficient hydrosilylation of olefins
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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
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p. 129 - 140
(2019/01/11)
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- Trialkylsilylethynyl-substituted triphenylenes and hexabenzocoronenes: Highly soluble liquid crystalline materials and their hole transport abilities
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Four triphenylene (TP) and four hexa-peri-hexabenzocoronene (HBC) derivatives with trialkylsilylethynyl groups were prepared and characterized by differential scanning calorimetry, polarizing optical microscopy, and X-ray diffraction measurements. All compounds were highly soluble in less-polar organic solvents and exhibited a columnar phase, Colh or Colr for the TPs, and Colh for the HBCs. The hole transport ability in the HBCs' columnar phase, 0.4-1.5×10-3 cm2 V-1 s-1 at 40-180°C, and its temperature dependence were determined by the time-of-flight method using a solution technique.
- Hirose, Takuji,Miyazaki, Yutaro,Watabe, Mizuki,Akimoto, Sho,Tachikawa, Tatsuya,Kodama, Koichi,Yasutake, Mikio
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p. 4714 - 4721
(2015/07/27)
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- SURFACE MODIFIED ORGANIC·INORGANIC HYBRID GLASS, PROTECTING GROUP INDUCED ALCOHOL OR ITS DERIVATIVE AND PRODUCING METHOD THEREOF
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Disclosed are a protected alcohol or derivative thereof, a surface- modified organic-inorganic hybrid glass, and preparation methods thereof. More specifically, disclosed are a protected alcohol or derivative thereof and a surface-modified organic-inorganic hybrid glass, which are prepared by allowing a silane compound, having vinyl or a vinyl derivative, to react with an alcohol or derivative thereof or with an organic-inorganic hybrid glass, in the presence of an acid catalyst, a transition metal catalyst and an organic solvent, so as to introduce an organic group thereto even at room temperature, as well as preparation methods thereof. The disclosed invention allows a functional group to be effectively introduced into alcohol or a derivative thereof or into an organic-inorganic hybrid glass, not only high temperatures but also room temperature, and thus is highly effective in introducing compounds having a thermally sensitive functional group, for example, natural compounds or proteins. Also, the invention makes it possible to introduce various organic groups and to separate and purify organic macromolecule-bonded organosilane compounds using a silica gel column so as to effectively introduce large organic functional groups to inorganic materials. Accordingly, the invention is highly useful in the chemical industry.
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Page/Page column 37-38
(2010/11/28)
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- The carbon-silicon bond cleavage of organosilicon compounds in supercritical water
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Arylsilanes, alkenylsilanes, allylic silanes, and alkylsilanes were found to undergo extremely facile and rapid C-Si bond cleavage in supercritical water. Rapid C-Si bond cleavage occurred even with robust unactivated tetraalkylsilanes. The control experiments revealed the dramatic difference between the supercritical and subcritical conditions, and that between supercritical water and supercritical methanol, attesting to a unique reactivity of supercritical water in C-Si bond cleavage. It was also found that acids, such as HCl, HBr, and H2SO4, promote C-Si bond cleavage in supercritical water.
- Itami, Kenichiro,Terakawa, Koji,Yoshida, Jun-Ichi,Kajimoto, Okitsugu
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p. 2071 - 2080
(2007/10/03)
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- Efficient and rapid C-Si bond cleavage in supercritical water
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Arylsilanes, alkenylsilanes, allylic silanes, and alkylsilanes were found to undergo extremely facile and rapid C-Si bond cleavage in supercritical water. The rapid C-Si bond cleavage occurred even with robust unactivated tetraalkylsilanes. The control experiments revealed the dramatic difference between supercritical and subcritical conditions and that between supercritical water and supercritical methanol, attesting to a unique reactivity of supercritical water in C-Si bond cleavage. Copyright
- Itami, Kenichiro,Terakawa, Koji,Yoshida, Jun-ichi,Kajimoto, Okitsugu
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p. 6058 - 6059
(2007/10/03)
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- ALKYLAMINOSILOXANES AS CORROSION INHIBITORS
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The instant invention discloses a composition comprising a carrier, preferably a packaging material, and at least one compound of the formula (I) in which the general symbols are as defined in claim 1 as corrosion inhibor for protecting metallic surfaces.
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- Fourier Transform Infrared Spectrometric Determination of Alkyl Chain Conformation on Chemically Bonded Reversed-Phase Liquid Chromatography Packings
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A series of dimethyl-n-alkyl bonded phase sorbent ranging in length from C1 to C22 have been prepared and studied by use of Fourier transform infrared spectrometry (FT-IR).Spectra have been produced for each of the bonded phases, and comparisons are made to the corresponding silane reagents.By use of assignments reported for nonplanar conformations of normal alkanes, the supramolecular structure of these bonded phase systems is examined.The presence of absorption bands at 1341, 1354, and 1367 cm-1 in the bonded phase spectra confirms that bonded alkyl chains are bent, i. e., a significant fraction of the carbon-carbon bonds are in the "gauche" configuration.The degree of conformational disorder in chemically bonded stationary phases is shown to be comparable to that observed in the corresponding n-alkane liquids at room temperature and above.Phase transitions for the bonded phases are not observed at temperatures near or below the melting points of alkane and silane reagents of comparable length.Instead, the bonded phase chains are seen to retain a notable degree of disorder at low temperature.Finally, the effect of mobile phase environment on chain conformation is examined for a range of deuterated water/methanol mixtures varying from 70percent to 100percent methanol.Evidence is presented that in this range the mobile phase effects a significant increase in the order of the stationary phase.
- Sander, Lane C.,Callis, James B.,Field, Larry R.
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p. 1068 - 1075
(2007/10/02)
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