Patents by Inventor Andreas Meudt

Andreas Meudt 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).

  • Process for preparing substituted benzyl compounds and toluene derivatives
    Publication number: 20010020104
    Abstract: The novel two-stage process described here makes it possible to obtain substituted benzyl compounds and toluene derivatives in a simple manner and in high yields by means of Suzuki-type coupling reactions of an aromatic with an organoboron compound, followed by a reduction. The process is particularly useful for preparing ortho-substituted benzyl compounds and toluene derivatives. The process can be applied to both intermolecular and intramolecular coupling reactions. Catalysts used for the coupling reaction are palladium compounds and/or nickel compounds. An advantageous aspect is that only very small amounts of catalyst are required.
    Type: Application
    Filed: February 22, 2001
    Publication date: September 6, 2001
    Applicant: Clariant GmbH
    Inventors: Steffen Haber, Stefan Scherer, Heinz Georg Kautz, Andreas Meudt, Frank Vollmuller
  • Process for the preparation of 4-(4'-chlorobiphenyl-4-yl)-4-keto-2-methylenebutyric acid
    Patent number: 6265607
    Abstract: The invention relates to a process for the preparation of 4-(4′-chlorobiphenyl-4-yl)-4-keto-2-methylenebutyric acid of the formula (I) by Friedel-Crafts acylation of 4-chlorbiphenly with itaconic anhydride, which comprises carrying out the Friedel-Crafts acylation in aromatic solvents at a temperature from −20 to +80° C.
    Type: Grant
    Filed: August 3, 1999
    Date of Patent: July 24, 2001
    Assignee: Clariant GmbH
    Inventors: Andreas Meudt, Wilfried Pressler, Antje Noerenberg, Steffen Haber, Michael Erbes, Robert Cosmo
  • Process for preparing arylpyridines
    Patent number: 6248892
    Abstract: 2-, 3- or 4-arylpyridines are prepared by reacting a halopyridine with an aryl Grignard compound, where the halogen is chlorine or bromine, in the presence of a palladium catalyst of the formula (IV)
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: June 19, 2001
    Assignee: Clariant GmbH
    Inventors: Antje Noerenberg, Steffen Haber, Andreas Meudt
  • Process for the preparation of paraoxadiazolyphenylboronic acids
    Patent number: 6197967
    Abstract: Compounds of the formula (I) are prepared by reacting a compound of the formula (V) with a compound of the formula (X) and hydrolyzing the product; or converting the compound of the formula (V) into the hydrazide, and cyclizing and hydrolyzing the latter to give the oxadiazole. para-Oxadiazolylphenylboronic acids are valuable precursors for active ingredients.
    Type: Grant
    Filed: December 13, 1999
    Date of Patent: March 6, 2001
    Assignee: Clariant GmbH
    Inventors: Frank Vollmueller, Steffen Haber, Andreas Meudt, Antje Noerenberg, Stefan Scherer
  • Process for the preparation of 4-chlorobiphenyls
    Patent number: 6066766
    Abstract: 4-Chlorobiphenyls are prepared by reacting a haloaromatic with an aryl Grignard compound, where halogen is chlorine, bromine or iodine, in the presence of a palladium catalyst of the formula (IV) ##STR1##
    Type: Grant
    Filed: August 3, 1999
    Date of Patent: May 23, 2000
    Assignee: Clariant GmbH
    Inventors: Steffen Haber, Stefan Scherer, Andreas Meudt, Antje Noerenberg