4371-91-9Relevant academic research and scientific papers
Formation of two- and three-dimensional hybrid mesostructures from branched siloxane molecules
Sakamoto, Shigeru,Shimojima, Atsushi,Miyasaka, Keiichi,Ruan, Juanfang,Terasaki, Osamu,Kuroda, Kazuyuki
, p. 9634 - 9635 (2009)
(Chemical Equation Presented) We report the design of a new precursor having three branching disiloxane units capable of forming 3D mesostructures with a cubic Pm-3n and its orthorhombic and tetragonal variants Cmmm and P4 2/mnm, in addition to a conventional 2D hexagonal (p6mm) mesostructure, thus creating a novel research area of mesostructural design in silica-organic nanohybrid materials.
Reaction of silicon with alcohols in autoclave
Krylova,Egorov,Nefedov
, p. 260 - 266 (2017/07/11)
A reaction of activated silicon with alcohols in an autoclave at 240—270 °C was studied. It was found that primary alcohols form tetraalkoxysilanes Si(OR)4 with high selectivity (up to 97%), while the secondary PriOH gave a mixture of compounds HSi(OPri)3, Si(OPri)4, HSi(OPri)2OSi(OPri)2H, HSi(OPri)2OSi(OPri)3, and Si(OPri)3OSi(OPri)3 with the predominance of trialkoxysilane (up to 67%). Carrying out the reaction under the indicated conditions has the advantage of experimental simplicity, reagent availability, high conversion of silicon, good isolated yields of products.
High-temperature reaction of SiO2 with methanol: Nucleophilic assistance of some N-unsubstituted benzazoles
Chibiryaev, Andrey M.,Kozhevnikov, Ivan V.,Martyanov, Oleg N.
, p. 159 - 167 (2013/06/26)
SiO2-containing materials (quartz, Pyrex glass, silica gel, and H-Y zeolite) react slowly with methanol at 350 C under both supercritical and gas-phase conditions. The amount of SiO2 reacted with supercritical methanol depends on the kind of the material and is varied from 0.05 wt% for quartz sand to 4.0 wt% for wide-porous silica gel for 5 h of the reaction. The main products of the reaction are methyl orthosilicates, mainly tetramethyl orthosilicate. N-Unsubstituted 1H-indole, 1H-benzimidazole, and 1H-indazole additives considerably increase the amount of reacted SiO2-containing material. Noteworthy, quartz sand solubility is increased ca 14-fold when indole is used at the same reaction conditions. These benzazoles provide a nucleophilic assistance to the reaction between SiO2 and methanol. During the assistance, the azole ring is methylated by methanol, and the participation of SiO2-surface or tetramethyl orthosilicate molecule facilitates the alkylation reaction of benzazole used.
Practical conversion of chlorosilanes into alkoxysilanes without generating HCl
Wakabayashi, Ryutaro,Sugiura, Yasushi,Shibue, Toshimichi,Kuroda, Kazuyuki
supporting information; experimental part, p. 10708 - 10711 (2011/12/05)
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
Nonhydrolytic synthesis of branched alkoxysiloxane oligomers Si[OSiH(OR)2]4 (R = Me, Et)
Wakabayashi, Ryutaro,Kawahara, Kazufumi,Kuroda, Kazuyuki
scheme or table, p. 5273 - 5277 (2010/10/21)
Beyond silanol: A branched siloxane oligomer bearing terminal dialkoxysilyl groups was nonhydrolytically synthesized by direct alkoxysilylation of a tetraalkoxysilane with a chlorodialkoxysilane in the presence of the Lewis acid BiCl3 (see scheme). The reaction proceeds without the formation of intermediate silanol groups, and provides a selective route for siloxane-based oligomers. (Chemical equation presented)
Multi-functional cyclic siloxane compound, siloxane-based polymer prepared from the compound and process for preparing dielectric film by using the polymer
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Page 15, (2010/02/10)
Disclosed herein are a multi-functional cyclic siloxane compound (A), a siloxane-based (co)polymer prepared from the compound (A), or the compound (A) and at least one of Si monomer having organic bridges(B), acyclic alkoxy silane monomer(C), and linear siloxane monomer (D); and a process for preparing a dielectric film using the polymer. The siloxane compound of the present invention is highly reactive, so the polymer prepared from the compound is excellent in mechanical properties, thermal stability and crack resistance, and has low dielectric constant resulting from compatibility with conventional pore-generating materials. Furthermore, low content of carbon and high content of SiO2 make enhance applicability to the process of semiconductor, therefore, this film is of great use as a dielectric film.
Chemistry of Silicon-Nitrogen Compounds, CLXVI: Organylamino Substitutions on Hexachlorodisiloxane
Wannagat, Ulrich,Bogedain, Gabriele,Hajibegli, Hamid,Moretto, Hans-Heinrich
, p. 865 - 874 (2007/10/02)
Reaction of hexachlorodisiloxane with primary and secondary amines leads - in dependence of stoichiometry - to numerous partially and totally organylamino substituted disiloxanes.Partially aminosubstituted chlorodisiloxanes are very sensitive to moisture and can be converted into disiloxanes with different organylamino groups.Exhaustive alkanolysis substitutes amino as well as chloro groups giving hexaalkoxydisiloxanes, but partial alkanolysis may substitute amino in preference to chloro groups.Mass spectra can be interpreted by abstraction of RR'N., RR'N+, RR'NH and (RR'N minus H) units.Most of the compounds are colourless liquids but hexakis(piperidino)-disiloxane melts at 270 deg C.
