Wacker Chemie Ag

Consortium Fur Elektrochemische Industrie Gmbh

Wacker-chemie Gmbh

Consortium Für Elektrochemische Industrie Gmbh & Co. Kg

Jürgen Stohrer

Bernhard Rieger

Peter Gigler

Hermann Petersen

Dominik Jantke

Klas Sorger

Stefan Haufe

Elke Fritz-Langhals

Harald Voit

Richard Goetze

Alfred Popp

Robert Maurer

Dieter Heldmann

Maria Leute

Florian Hoffmann

Christian Anger

Tobias Halbach

Rupert Pfaller

Jodoca Rockinger-Mechlem

Jürgen Oliver Daiss

Timo Hagemeister

Christian Brüninghaus

Andrea Gilch

Rebecca Bernhard

Jennifer Wegener

Wolfgang Doring

Sebastian Suckow

Sefer Ay

Sascha André Erhardt

The invention relates to spherical, nonporous Silicon particles having average particle sizes (d) of 1 to 10 pm and a silicon content of 97 to 99.8 wt. %, the silicon content relating to the total weight of the silicon particles minus any oxygen content.

Silicon particles for anode materials of lithium ion batteries

The invention relates to methods for producing non-aggregated, modified silicon particles by treating non-aggregated silicon particles which have volume-weighted particle size distributions with diameter percentiles dof 1.0 &#x3bc;m to 10.0 &#x3bc;m at 80&#xb0; C. to 900&#xb0; C. with an oxygen-containing gas.

Methods for modifying silicon particles

The invention relates to polymer-grafted silicon particles, wherein the silicon particles have an average particle size (d50) of 700 nm to 10 &#x3bc;m and the polymers of the polymer-grafted silicon particles are attached to the silicon particles in a wash-stable manner in an aqueous medium.

Polymer-grafted silicon particles

The invention relates to non-aggregated carbon-coated silicon particles having average particle diameters dof 1 to 15 &#x3bc;m, which particles contain &#x2264;10 wt % carbon and &#x2265;90 wt % silicon, each based on the total weight of the carbon-coated silicon particles

Carbon-coated silicon particles for lithium ion batteries

A process for selective transvinylation of a reactant carboxylic acid with a reactant vinyl ester to give a product vinyl ester and the corresponding acid of the reactant vinyl ester in the presence of one or more ruthenium catalysts, wherein a) the reactant vinyl ester, the reactant carboxylic acid and the ruthenium catalyst are supplied to a reactor, wherein b) the molar ratio of reactant vinyl ester to reactant carboxylic acid is 1:3 to 3:1, and c) the transvinylation reaction is conducted, d) on completion of the transvinylation reaction, the reactant vinyl ester and the corresponding acid are separated from the reaction mixture by distillation, e) the product vinyl ester is separated by distillation from the bottom product of the distillation, and f) the remaining reaction mixture is recycled into the reactor.

Process for ruthenium-catalysed transvinylation of carboxylic acids

A process for selective transvinylation of a reactant carboxylic acid with a reactant vinyl ester to give a product vinyl ester and the corresponding acid of the reactant vinyl ester in the presence of one or more ruthenium catalysts, wherein a) the reactant vinyl ester, the reactant carboxylic acid and the ruthenium catalyst are supplied to a reactor, and b) the transvinylation reaction is conducted, wherein c) the transvinylation reaction is conducted at a conversion of more than 50%, d) on completion of the transvinylation reaction, the reactant vinyl ester and the corresponding acid are separated from the reaction mixture by distillation, e) the product vinyl ester is separated by distillation from the bottom product of the distillation, and f) the remaining reaction mixture is recycled into the reactor.

The invention relates to a method for separating a mixture containing at least one carboxylic acid vinyl ester of general formula R'&#x2014;C(O)O&#x2014;CH&#x2550;CHand at least one carboxylic acid of general formula R&#x2032;&#x2014;COOH, wherein R&#x2032; in either case can be an aliphatic group having 12 to 22 C atoms or a cycloaliphatic group having 12 to 22 C atoms, or an aromatic group having 12 to 22 C atoms, and R&#x2032; can be identical or different, characterized in that the carboxylic acid is converted to its anhydride R&#x2032;&#x2014;C(O)&#x2014;O&#x2014;C(O)&#x2014;R&#x2032; and the carboxylic acid vinyl ester is subsequently separated.

Method for separating high-boiling carboxylic acid vinyl ester/carboxylic acid mixtures

The invention relates to a process for transvinylation of a carboxylic acid feedstock with a vinyl ester feedstock to obtain a vinyl ester product and the corresponding acid of the vinyl ester feedstock in the presence of one or more ruthenium catalysts, wherein a) the vinyl ester feedstock, the carboxylic acid feedstock and a ruthenium catalyst are fed to the reactor, and b) the transvinylation reaction is carried out, characterized in that a carbonyl-free Ru(III) carboxylate is used as the ruthenium catalyst and in that no carbon monoxide is supplied, c) the reaction is carried out at a temperature of 110 to 170&#xb0; C., d) upon completion of the transvinylation reaction, the vinyl ester feedstock and the corresponding acid are separated from the reaction mixture by distillation, e) the vinyl ester product is separated by distillation from the bottom product of the distillation, and f) the remaining reaction mixture is recycled into the reactor.

Process for ruthenium-catalyzed transvinylation of carboxylic acids

An enantioselective method for producing optically active 3-alkyl carboxylic acids comprises transforming an optically active secondary alcohol into an optically active, activated compound by introducing a leaving group; reacting the activated compound with a malonic acid derivative to obtain an optically active, alkylated malonic acid compound, the reaction taking place exclusively in ether and/or carboxylic acid ester solvents and one or more aprotic polar solvents or alcohols as a cosolvent in a maximum proportion of 30 volume percent of total solvent, wherein the added cosolvent is not hexamethyl phosphoric acid triamide; the malonic acid compound is hydrolyzed if necessary to obtain the corresponding acid; and the corresponding acid is decarboxylated.

Method for the production of optically active 3-alkylcarboxylic acids and the intermediate products thereof

A process for preparing alkynecarboxylic acids includes the oxidation of an alkyne alcohol with a hypohalite in the presence of a nitroxyl compound at a pH of greater than 7 with continual addition of the alkyne alcohol and of the hypohalite to the reaction mixture.

Process for preparing alkynecarboxylic acids by oxidation of alkyne alcohols

A process for preparing &#x3b1;-functionalized thiazolidines or oxazolidines, each of which are oxycarbonyl-functionalized in the 4-position, by adding a base to a reaction mixture comprising an oxycarbonyl-functionalized thiazolidine or oxazolidine and an electrophile at a temperature of greater than &#x2212;40&#xb0; C.

Process for the electrophilic substitution of thiazolidines or oxazolidines

A process is provided for preparing optically active alcohols, amines and derivatives thereof by reacting aldehydes or imines at a temperature of less than 15&#xb0; C. in the presence of a chiral, enantiomerically pure auxiliary with an organozinc halide which is obtained from zinc and a reactive halogen compound, and water, acid or base, or an alkylating, arylating, acylating or silylating reagent is subsequently added.

Enantioselective reformatsky process for preparing optically active alcohols, amines and derivatives thereof

A process for removing zinc from organic solutions comprising zinc alkoxides or zinc amides, includes admixing the solution with an alkylating, arylating, acylating or silylating agent in the presence of a precipitating reagent having at least two nitrogen donors and subsequently removing the precipitated solid.

Removal of zinc salts from nonaqueous synthesis solutions comprising zinc alkoxides or zinc amides

A process is provided for preparing an enantiopure 1,3-dioxolan-4-one or 1,3-oxathiolan-5-one derivative, which includes bringing a mixture containing enantiomeric 1,3-dioxolan-4-one or 1,3-oxathiolan-5-one derivatives and an enzyme with hydrolytic activity into contact in the presence of a nucleophile. Cleaving a dioxolanone/oxathiolanone ring of one enantiomer occurs by the enzyme with hydrolytic activity and, after the cleavage of one enantiomer has taken place, the uncleaved enantiomer of the 1,3-dioxolan-4-one or 1,3-oxathiolan-5-one derivative is isolated.

Process for the enzymatic preparation of enantiopure 1, 3-dioxolan-4-one and 1,3-oxathiolan-5-one derivatives

The preparation of an aqueous dispersion can be based on at least one water-insoluble organopolymer, on at least one water-dispersible silicon compound and on at least one water-soluble or dispersible phosphorus compound.

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Pullach, Germany

Jürgen Stohrer