Patents by Inventor Armin Meijere

Armin Meijere 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 the catalytic, symmetric disubstitution of carboxylic acid amides with grignard reagents
    Patent number: 6515180
    Abstract: The invention relates to a method for symmetrically disubstituting carboxylic acid amides on the geminal carbonyl-C-atom using grignard reagents in the presence of a metal alcoholate compound used as a catalyst and in the presence of another organometalic compound used as a co-catalyst.
    Type: Grant
    Filed: March 7, 2001
    Date of Patent: February 4, 2003
    Assignee: Merck Patent Gesellschaft
    Inventors: Herwig Buchholz, Urs Welz-Biermann, Armin Meijere
  • Method for symmetrically and asymmetrically disubstituting carboxylic acid amides with organotitanates and grignard reagents
    Patent number: 6479661
    Abstract: The invention relates to a method for disubstituting carboxylic acid amides on a geminal carbonyl-C-atom using a Grignard reagent in the presence of an organotitanate.
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: November 12, 2002
    Assignee: Merck Patent Gesellschaft
    Inventors: Herwig Buchholz, Urs Welz-Biermann, Armin Meijere, Vladimir Chaplinski
  • Method for catalytically disubstituting carboxylic acid amides with at least one grignard reagent
    Patent number: 6448445
    Abstract: The invention relates to a method for disubstituting carboxylic acid amides on the geminal carbonyl-C-atom using at least one grignard reagent in the presence of a metal alcoholate compound used as a catalyst and in the presence of another organometallic compound used as a co-catalyst.
    Type: Grant
    Filed: February 23, 2001
    Date of Patent: September 10, 2002
    Assignee: Merck Patent Gesellschaft mit beschraenkter Haftung
    Inventors: Herwig Buchholz, Urs Welz-biermann, Armin Meijere