Patents by Inventor Lars Rodefeld

Lars Rodefeld has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for producing 2,3,5,6-tetrahalogen-xylylidene compounds
    Publication number: 20020198401
    Abstract: The invention relates to a process for preparing 2,3,5,6-tetrahaloxylylidene compounds of formula (I) 1
    Type: Application
    Filed: July 24, 2002
    Publication date: December 26, 2002
    Inventors: Reinhard Langer, Lars Rodefeld
  • Preparation and use of palladium catalysts for cross-coupling reactions
    Publication number: 20020173421
    Abstract: The invention relates to a process for preparing meterable solutions or dispersions of palladium catalysts, to these solutions or dispersions of such catalysts, and to the use of such catalysts in cross-coupling reactions.
    Type: Application
    Filed: May 13, 2002
    Publication date: November 21, 2002
    Inventors: Lars Rodefeld, Thomas Hopfner, Claus-Peter Reisinger
  • Process for preparing halogen-substituted dibenzyl alcohols, these halogen-substituted dibenzyl alcohols and their use
    Publication number: 20020156330
    Abstract: A novel process allows a simple preparation of highly pure halogen-substituted dibenzyl alcohols by reduction of the corresponding halogen-substituted terephthalic acids and reaction with an alkylating agent, sulfuric acid, alkyl- or arylsulfonic acids. The highly pure halogen-substituted dibenzyl alcohols obtained are suitable in particular for preparing pharmaceutically or agrochemically active compounds.
    Type: Application
    Filed: April 5, 2002
    Publication date: October 24, 2002
    Inventor: Lars Rodefeld
  • Method for preparing methyl carbazate
    Patent number: 6465678
    Abstract: Methyl carbazate which is particularly pure and has a particularly low tendency toward discoloration is obtained from hydrazine and dimethyl carbonate if the two reactants are metered simultaneously into an initially introduced first solvent at from −20 to +30° C., the solvent and low-boiling components are then distilled off under reduced pressure, and then either a second solvent is added to the crude methyl carbazate present and this solvent is distilled off under reduced pressure or an inert gas is passed through the crude methyl carbazate present.
    Type: Grant
    Filed: July 20, 2001
    Date of Patent: October 15, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Lars Rodefeld, Horst Behre, Alexander Klausener, Robert Söllner
  • Process for preparing optionally substituted biphenylcarbonyl chlorides
    Publication number: 20020062043
    Abstract: Optionally substituted biphenylcarbonyl chlorides are obtained in an economically and ecologically advantageous manner by reacting biphenyls with oxalyl chloride in a molar ratio of biphenyl to oxalyl chloride of from 0.7 to 1.5 in the presence of a Lewis acid.
    Type: Application
    Filed: November 7, 2001
    Publication date: May 23, 2002
    Inventors: Lars Rodefeld, Alexander Klausener, Friedrich-Wilhelm Ullrich
  • Process for the preparation of salts of 1-substituted 2,4-diaminobenzenes
    Patent number: 6204413
    Abstract: The invention relates to a process for the preparation of specific salts of 1-substituted 2,4-diaminobenzenes by catalytic hydrogenation of 1-substituted 2,4-dinitrobenzenes and addition of the reaction product obtained after the hydrogenation and separated from the catalyst to an aqueous solution of an acid.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: March 20, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Lars Rodefeld, Alexander Klausener, Horst Behre
  • Process for the preparation of 1-substituted 2,4-dinitrobenzenes
    Patent number: 6198007
    Abstract: Provided is a process for the preparation of specific 1-substituted 2,4-dinitrobenzenes by reaction of 1-halogeno-2,4-dinitrobenzenes with mono-alkali metal salts of specific diols, in which the 1-halogeno-2,4-dinitrobenzene and the mono-alkali metal salt of the diol are simultaneously added and reacted.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: March 6, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Lars Rodefeld, Alexander Klausener, Ferdinand Hagedorn