1112-39-6Relevant articles and documents
Dimethoxydimethylsilane from silicon atoms and dimethyl ether: A combined matrix-spectroscopic and density functional theory study
Maier, Guenther,Glatthaar, Joerg
, p. 3350 - 3363 (2003)
The reaction between silicon atoms and dimethyl ether (6) has been studied in an argon matrix at 10 K and in solid dimethyl ether (6) at temperatures up to 80 K. In the initial step, a triplet n-adduct T-5 is formed between a silicon atom and 6. The next step needs photochemical activation. Depending on the relative dimethyl ether/argon ratio, the photoproduct is either dimethylsilanone (1) or singlet methoxymethylsilylene (S-2), which, in the presence of an excess of 6, exists as a dimethyl ether complex 8 of silylene S-2. Longer irradiation transforms dimethyl ether addition compounds S-8-t/ S-8-c into dimethoxydimethylsilane (7). If irradiation is applied directly during cocondensation of silicon atoms with 6, the only detectable products are 8 and 7. Upon further irradiation of the pure dimethyl ether matrix, the rest of 8 is also photoisomerized, and dimethoxydimethylsilane (7) is observed exclusively. The structural elucidation of all new species is based on comparison of the experimental observations with density functional theory calculations. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
Heteroorganic betaines 4. Photolysis and thermolysis of betaines containing the +P - C - Si - S- structural fragment
Borisova,Zemlyanskii,Shestakova,Khrustalev,Ustynyuk,Chernyshev
, p. 1583 - 1592 (2000)
Phololysis and thermal decomposition of betaines R3P - CR1R2 - SiR3R4 - S- (1) follows two main pathways: (a) a Corey - Chaykovsky type reaction with elimination of Ph3P and generation of silathiirane R1R2C - SiR3R4 - S (2) and (b) a retro-Wittig type reaction accompanied by elimination of R3P=CR1R2 and generation of silanethione R3R4Si=S (3). Highly reactive compounds 2 and 3 undergo subsequent transformations to give derivatives of tetrahydro-1,4-dithia-2,5-disilin, 1,3-dithia-2,4-disilolane, and phosphonium salts of symm-tetraorganodisilthiane dithiolates [Ph3P+CHR1R2]2[(R3R4SiS-)2S]. The structures of the compounds obtained were established by X-ray diffraction analysis and multinuclear NMR spectroscopy.
Synthesis, structure, and reactivity of hydridobis(silylene)ruthenium(IV)- xantsil complexes (xantsil = (9,9-dimethylxanthene-4,5-diyl)bis(dimethylsilyl)) - A stabilized form of key intermediates in the catalytic oligomerization- deoligomerization of hydrosilanes
Okazaki, Masaaki,Minglana, Jim Josephus Gabrillo,Yamahira, Nobukazu,Tobita, Hiromi,Ogino, Hiroshi
, p. 1350 - 1358 (2003)
Ru {K2(Si,Si)-xantsil}(CO)(η6-C6H 5CH3) (1) was found to be a catalyst for oligomerization-deoligomerization of HSiMe2SiMe3 to give H(SiMe2)nMe (n = 1-8 at 90°C for 2 days). Treatment of 1 with HSiMe2SiMe2OR (R = Me, f-Bu) led to quantitative formation of Ru{κ3(O,Si,Si)-xantsil}(CO)(H) {(SiMe2...O(R)...SiMe2)} (R = Me (2a), t-Bu (2b)), which also worked as a catalyst for oligomerization-deoligomerization of HSiMe2SiMe3. Based on these experimental results, a mechanism involving silyl(silylene) intermediates was proposed for the oligomerization-deoligomerization of HSiMe2SiMe3. Complex 2a reacted with MeOH in toluene-d8 to give Ru{κ 2(Si,Si)-xantsil}(CO)(η6-toluene-d8) and Me2Si(OMe)2 with evolution of H2. Under a CO atmosphere, 2a was smoothly converted to its CO adduct Ru{κ 2(Si-Si)-xantsil}(CO)2(H){(SiMe2...O(Me) ...SiMe2)} (3).
Deoligomerization of siloxanes with dimethyl carbonate over solid-base catalysts
Okamoto,Miyazaki,Kado,Suzuki
, p. 1838 - 1839 (2001)
Hexamethyldisiloxane and hexamethylcyclotrisiloxane were almost completely deoligomerized with dimethyl carbonate over alumina-supported potassium fluoride catalyst to form methoxytrimethylsilane (85% yield) and dimethoxydimethylsilane (94% yield), respec
Insertion of pyridine into an iron-silicon bond: Structure of the product Cp*(CO)Fe{η3(C,C,C)-C5H5NSiMe 2NPh2}
Iwata, Masatoshi,Okazaki, Masaaki,Tobita, Hiromi
, p. 2744 - 2745 (2003)
Heating a toluene solution of Cp*(CO)(C5H 5N)FeSiMe2NPh2 led to insertion of pyridine into the iron-silicon bond to form Cp*(CO)Fe{η3(C,C,C)-C 5H5NSiMe2NPh2}.
Synthesis of dialkoxydimethylsilanes and 2,2-dimethyl-1,3-dioxa-1- silacyclo compounds
Lin, Ji-Mao,Zhou, Ai-Min,Zhang, Hui,Hao, Ai-You
, p. 2527 - 2532 (1997)
In the presence of iodine, magnesium reacts with alcohols to give magnesium alkoxides, which are treated with octamethylcyclotetrasiloxane to produce dialkoxydimethylsilanes. Similarly, magnesium reacts with 1,3, 1,4 and 1,5 diols and then with octamethylcyclotetrasiloxane, producing 2, 2- dimethyl-1 3-dioxa-2-silacyclo compounds.
METHOD FOR PREPARING ALKYLALKOXYSILANES
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Paragraph 0038, (2020/03/29)
A method is useful for preparing alkylalkoxysilanes, such as alkylalkoxysilanes, particularly dimethyldimethoxysilane. The method includes heating at a temperature of 150°C to 400°C, ingredients including an alkyl ether and carbon dioxide, and a source of silicon and catalyst. The carbon dioxide eliminates the need to add halogenated compounds during the method.
Dimethyldimethoxysilane preparation method
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Paragraph 0026-0033, (2019/02/08)
The invention discloses a dimethyldimethoxysilane preparation method, which comprises: continuously adding dimethyldichlorosilane into the methanol solution of sodium methoxide, and carrying out alcoholysis. According to the present invention, the preparation method has advantages of mild reaction conditions, easy operation, low equipment input, convenient scale production, high product yield andlow chlorine content in the product.
Ethyl phenyl dimethoxy silane and its preparation method
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Paragraph 0023; 0024, (2017/01/02)
The invention relates to the field of organic chemistry. In order to solve dual problems of equipment loss and environmental pollution generated in synthesis of ethyl phenyl dimethoxysilane by virtue of an alcoholysis method, the invention provides ethyl phenyl dimethoxysilane and a preparation method thereof. Ethyl phenyl dimethoxysilane is prepared from ethyl trimethoxysilane and chlorobenzene as raw materials by virtue of a sodium condensation method. The reaction conditions are mild, no harms to the environment and equipment are caused and the process is simple and is very suitable for large-scale industrial production.
Amorphous silicon: New insights into an old material
Spomer, Natalie,Holl, Sven,Zherlitsyna, Larissa,Maysamy, Fariba,Frost, Andreas,Auner, Norbert
, p. 5600 - 5616 (2015/03/30)
Amorphous silicon is synthesized by treating the tetrahalosilanes SiX4 (X=Cl, F) with molten sodium in high boiling polar and non-polar solvents such as diglyme or nonane to give a brown or a black solid showing different reactivities towards suitable reagents. With regards to their technical relevance, their stability towards oxygen, air, moisture, chlorine-containing reaction partners RCl (R=H, Cl, Me) and alcohols is investigated. In particular, reactions with methanol are a versatile tool to deliver important products. Besides tetramethoxysilane formation, methanolysis of silicon releases hydrogen gas under ambient conditions and is thus suitable for a decentralized hydrogen production; competitive insertion into the MeO-H versus the Me-OH bond either yields H- and/or methyl-substituted methoxy functional silanes. Moreover, compounds, such as MenSi(OMe)4-n (n=0-3) are simply accessible in more than 75% yield from thermolysis of, for example, tetramethoxysilane over molten sodium. Based on our systematic investigations we identified reaction conditions to produce the methoxysilanes MenSi(OMe)4-n in excellent (n=0:100%) to acceptable yields (n=1:51%; n=2:27%); the yield of HSi(OMe)3 is about 85%. Thus, the methoxysilanes formed might possibly open the door for future routes to silicon-based products. Amorphous silicon is easily synthesized from tetrahalosilanes SiX4 (X=Cl, F) and molten sodium in different solvents. Reactivity studies prove the resulting materials as versatile tools for the formation of technical important silanes, such as the silicon chloro-, alkoxy-, and methylalkoxy-substituted derivatives (see figure; bl=black, br=brown).
