1829-40-9Relevant articles and documents
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Szmant,Brost
, p. 5763 (1950)
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The interaction of fluoride ion with organosilicons: facile isomerizations and new reactions of silicon hydrides
Blankenship, Craig,Cremer, Sheldon E.
, p. 19 - 30 (1989)
Cesium fluoride isomerization of several derivatives of 3-silabicyclooctane and 2-silabicycloheptane as well as chiral α-NpPhMeSiH are described.The effect of solvent, 18-crown-6 ether, and other salts is discussed.Associated side reactions prompted study of the conversion of Ph3SiH to Ph3SiF by CsF and the identification of the products formed from the reaction of Ph3SiH with DMF, N-methylformanilide, and benzamide in the presence of metal fluorides.
Brook et al.
, p. C11 (1976)
Silane-silanol dehydrocondensation. The microscopic reverse of hydrogen activation by an organometallic oxide complex
Klingler, R. J.,Krause, T. R.,Rathke, J. W.
, p. 81 - 94 (1988)
Hydrogen evolution from the dehydrocondensation reaction of triphenylsilane with triphenylsilanol is catalyzed by sodium trimethylsiloxide at 90 deg C in dioxane solvent.This system is the first example of a silane hydrolysis reaction that exhibits simple first order kinetics when investigated under second order conditions, equal concentrations of silane to proton source.Further analysis of the kinetics by the method of initial rates indicates that the reaction is first order in silane and zero order in silanol, demonstrating a multistep mechanistic process and that the proton source is not involved in the rate limiting step.The microscopic reverse process, hydrogen activation, has been investigated at 200-250 deg C and 330 atm of hydrogen using hexamethyldisiloxane and sodium trimethylsiloxide to yield significant, 12percent, quantities of trimethylsilyl hydride; however, the reaction has limited application since the methyl groups are concurrently cleaved to the organic product methane under these conditions.
Cobalt-Catalyzed Selective Synthesis of Disiloxanes and Hydrodisiloxanes
Pattanaik, Sandip,Gunanathan, Chidambaram
, p. 5552 - 5561 (2019/06/05)
Selective syntheses of symmetrical siloxanes and cyclotetrasiloxanes are attained from reactions of silanes and dihydrosilanes, respectively, with water, and the reactions are catalyzed by a NNNHtBu cobalt(II) pincer complex. Interestingly, when phenylsilane was subjected to catalysis with water, a siloxane cage consisting 12 silicon and 18 oxygen centers was obtained and remarkably the reaction proceeded with liberation of 3 equiv of molecular hydrogen (36 H2) under mild experimental conditions. Upon reaction of silane with different silanols, highly selective and controlled syntheses of higher order monohydrosiloxanes and disiloxymonohydrosilanes were achieved by cobalt catalysis. The liberated molecular hydrogen is the only byproduct observed in all of these transformations. Mechanistic studies indicated that the reactions occur via a homogeneous pathway. Kinetic and independent experiments confirmed the catalytic oxidation of silane to silanol, and further dehydrocoupling processes are involved in syntheses of symmetrical siloxanes, cyclotetrasiloxanes, and siloxane cage compounds, whereas the unsymmetrical monohydrosiloxane syntheses from silanes and silanols proceeded via dehydrogenative coupling reactions. Overall these cobalt-catalyzed oxidative coupling reactions are based on the Si-H, Si-OH, and O-H bond activation of silane, silanol, and water, respectively. Catalytic cycles consisting of Co(II) intermediates are suggested to be operative.
FLAME RETARDANT RESIN COMPOSITION
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Paragraph 00113; 00114, (2018/02/28)
A flame-retarded resin includes at least one resin for which flame retardant capability is desired and at least one triaryl silicon-containing compound (I) as flame retardant in admixture therewith and/or chemically bonded, e.g.. grafted, to the resin.
