Wacker Chemie Ag

Consortium Fur Elektrochemische Industrie Gmbh

Juergen Stohrer

Bernhard Rieger

Hermann Petersen

Florian Hoffmann

Elke Fritz-Langhals

Oliver Schaefer

Dieter Heldmann

Tobias Halbach

Christian Anger

Franz-Heinrich Kreuzer

Dominik Jantke

Stefan Haufe

Peter Gigler

Klas Sorger

Johannes Freudenreich

Hans-Joachim Luckas

Juergen Oliver Daiss

Andreas Boehm

Wolfgang Doering

Sotirios Kneissl

Willibald Lottner

Sascha Andre Erhardt

4-(dialkylchlorosilyl)butyronitriles are prepared by high yield by reacting a mixture of technical grade allyl cyanide with dialkylchlorosilanes in the presence of a catalyst of transition group 8 of the Periodic Table of the Elements, wherein the reaction is conducted such that a stoichiometric excess of the dialkylchlorosilane is present together with the catalyst in the reaction mixture, into which the allyl cyanide is metered.

Method for producing 4-(dialkylchlorosilyl)-butyronitrile

Silicon is produced by magnesiothermic reduction of silicon dioxide, wherein to achieve magnesiothermic reduction a reactant mixture is employed which contains silicon dioxide (SiO) and magnesium (Mg) and, as moderators, magnesium oxide (MgO) and silicon (Si), and optionally further moderators.

Processes for producing silicon

The invention provides mixtures, liquid at 25&#xb0; C., of methylpolysiloxanes comprising at least two methylpolysiloxanes selected from linear compounds of the general formula I MeSiO-(MeSiO)x-SiMe(I), and cyclic compounds of the general formula II (MeSiO)y (II), wherein the mixture comprises at least one linear methylpolysiloxane of the general formula I and at least one cyclic methylpolysiloxane of the general formula II, Me means methyl radical, x has values greater than or equal to zero and the arithmetic mean of x, weighted by the molar proportions, over all linear methylpolysiloxanes is between 3 and 20, y has values greater than or equal to 3 and the arithmetic mean of y, weighted by the molar proportions, over all cyclic methylpolysiloxanes is between 3 and 6, the numerical ratio of the MeSi&#x2014; chain ends groups in the compounds of the general formula I to the sum of the MeSiO&#x2014; units in the compounds of the general formulae I and II is at least 1:2 and at most 1:10, and further definitions are described in claim, and the use of the mixtures as heat carrier fluids.

Siloxane mixtures

Compounds of the general formula (4) are prepared by polymerization of oxasilacycles in the presence of an acid catalyst. 

Crosslinkable siloxanes by acid-catalyzed polymerization of oxasilacycles

Oxasilacycles are prepared by the intramolecular condensation of silanes bearing Si-bonded hydrogen and ethylenically unsaturated radicals in the presence of a triorganoborane, aminoborane complex, or phosphine-borane complex as a hydrosilylation catalyst. Spirocyclic oxasilacycles, and alkoxy-substituted oxaspirocycles with quaternary substitution of a C atom adjacent to oxygen may be prepared.

Oxasilacycles and method for the production thereof

Aminoalkylalkoxysilanes are prepared from halo(haloalkyl)silanes in the simultaneous presence of ammonia or primary organic amine and alcohol.

Method for producing aminoalkylalkoxysilanes

Hydroxymethyl-functional siloxanes and silica gels are prepared by reacting a siloxacycle having at least one unit of the formula [SiR(OR)&#x2014;CH&#x2014;O]with water, optionally in the presence of a hydrolyzable silane.

Method for preparing poly(hydroxymethyl)-functional siloxanes and silica gels

Lateral hydroxymethyl-substituted organopolysiloxanol are prepared by reacting a silanol-stopped organosiloxane with a hydrolyzable methyleneoxy-group-containing organosilicon compound.

Method for preparing (hydroxymethyl)polysiloxanes

Silanes containing an ester group are produced in high yield and purity by reacting a salt of a carboxylic acid with a silane containing a carboxylate substitutable leaving group following by distilling the product mixture to obtain a distillate containing the ester group containing silane product, wherein a solvent having a boiling point higher than the product is contained in the product mixture during at least a terminal portion of the distillation.

Method for producing ester-functional silanes

The invention relates to a novel process for hydroxymethylating noncyclic &#x3b1;,&#x3b1;-dialkylcarboxylic acid derivatives with formaldehyde using amide bases at temperatures of from &#x2212;40&#xb0; C. up to the boiling point of the solvent or solvent mixture used.

Process for preparing &#x3b1;, &#x3b1;-dialkyl-&#x3b1;-hydroxymethyl-carboxylic acid derivatives

Silanes of the formulaRRSiL&#x2003;&#x2003;(I)where each R is identical or different and is a monovalent, optionally substituted hydrocarbon radical which is free of aliphatic carbon&#x2014;carbon multiple bonds and has from 1 to 18 carbon atoms per radical,

Norbornyl-substituted silanes and the use thereof

Removal of free aldehydes

An alcohol is oxidized to an aldehyde or a ketone in the presence of a nitroxyl compound as catalyst, wherein the alcohol to be oxidized is contained in an organic liquid phase, and is reacted in the presence of a nitroxyl compound with an aqueous phase comprising an oxidant. The reaction is carried out continuously at a contact time of the phases of from 0.1 s to a maximum of 15 minutes, with intensive mixing of the phases. The process produces high yields with low quantities of other oxidation byproducts.

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Pullach, Germany

Juergen Stohrer