2157-45-1Relevant academic research and scientific papers
SYMMETRICAL AND UNSYMMETRICAL ORGANOSILICON MOLECULES AND ELECTROLYTE COMPOSITIONS
-
Page/Page column 38, (2014/03/26)
Described are organosilicon electrolyte compositions having improved thermostability and electrochemical properties and electrochemical devices that contain the organosilicon electrolyte compositions.
Process for preparing alkoxysilanes
-
, (2008/06/13)
Alkoxysilanes are prepared by a process, comprising: (i) reacting a chlorosilane with an alcohol in a water-free and solvent free phase with removal of the liberated hydrogen chloride; (ii) transferring the resultant product mixture into a liquid phase to be distilled and adding a metal alcoholate to the product mixture in the liquid at a temperature in the range from 10-60° C., and thoroughly mixing the neutralized product mixture, said alcoholate being employed in an equimolar amount or in a stoichiometric excess based on the amount of acidic chloride, and (iii) purifying the treated product mixture by distillation under reduced pressure, thereby preparing alkoxysilanes which are low in acidic chloride or essentially free of acidic chloride.
Process for preparing low-chloride or chloride-free alkoxysilanes
-
, (2008/06/13)
A process for preparing an alkoxysilane with an acidic chloride content of less than 10 ppm by weight, comprising: reacting a chlorosilane with an alcohol in a water-free and solvent-free phase to form a product mixture containing alkoxysilane and residual acidic chloride, with removal of resultant hydrogen chloride from the product mixture, then adding liquid or gaseous ammonia, in an amount corresponding to a stoichiometric excess, based on the content of acidic chloride, to form an ammonia-containing product mixture, treating the ammonia-containing product mixture at a temperature between 10 and 50 DEG C., wherein the ammonia and acidic chloride undergo neutralization, to form a crude product, and optionally, then separating off a salt formed in the course of neutralization, from the crude product, and recovering the alkoxysilane by distilling the crude product.
Conformational transmission in silatranes. Confirmation of the pentacoordinated structure in solution
Genderen, Marcel H. P. van,Buck, Henk M.
, p. 449 - 452 (2007/10/02)
A 300-MHz (1)H-NMR conformational analysis study of a set of pentacoordinated silicon compounds (silatranes) and their tetracoordinated counterparts is presented.The solution conformation of the silatranes shows a close resemblance to known X-ray structures, although the silatrane conformation was found to depend upon the solvrnt polarity.Comparison of the conformation of a 2-methoxyethoxy fragment in the tetra-and pentacoordinated systems showed the existence of conformational transmission, similar to that known for phosphorus compounds.Enhanced electrostatic repulsion between the vicinal oxygens in the 2-methoxyethoxy fragment produces a trans conformation around the C-C bond in the pentacoordinated silatranes.The conformational transmission effect is smaller in silatranes than in phosphorus compounds, due to a relatively weak fifth bond.
Process for the manufacture of monomeric and oligomeric silicic acid esters
-
, (2008/06/13)
An improvement in a process for forming an orthosilicic acid ester or an oligomer thereof by contacting a tetrachlorosilane or higher homolog thereof with a primary alcohol, the improvement which comprises introducing the alcohol directly into a tetrachlorosilane liquid phase without said alcohol touching the gas phase and, after completion of the reaction, removing hydrogen chloride formed during the reaction from the reaction zone.
