Patents by Inventor David Richard Parrish

David Richard Parrish 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).

  • Asymmetric synthesis of organic compounds
    Patent number: 4108898
    Abstract: Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.
    Type: Grant
    Filed: September 14, 1976
    Date of Patent: August 22, 1978
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Zoltan George Hajos, David Richard Parrish
  • Asymmetric synthesis of organic compounds
    Patent number: 4102929
    Abstract: Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.
    Type: Grant
    Filed: September 14, 1976
    Date of Patent: July 25, 1978
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Zoltan George Hajos, David Richard Parrish
  • Antioxidant chroman compounds
    Patent number: 4026907
    Abstract: The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: May 31, 1977
    Assignee: Hoffmann-La Roche Inc.
    Inventors: John William Scott, David Richard Parrish, Gabriel Saucy
  • Antioxidant chroman compounds
    Patent number: 4018799
    Abstract: The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: April 19, 1977
    Assignee: Hoffmann-La Roche Inc.
    Inventors: John William Scott, David Richard Parrish, Gabriel Saucy
  • Antioxidant chroman compounds
    Patent number: 4003919
    Abstract: The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
    Type: Grant
    Filed: December 4, 1975
    Date of Patent: January 18, 1977
    Assignee: Hoffmann-La Roche Inc.
    Inventors: John William Scott, David Richard Parrish, Gabriel Saucy
  • 2-Alkyl-2-(3-oxoalkyl)-1,3-cyclopentadiones
    Patent number: 3975442
    Abstract: Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.
    Type: Grant
    Filed: May 6, 1974
    Date of Patent: August 17, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Zoltan George Hajos, David Richard Parrish
  • Asymmetric synthesis of organic compounds
    Patent number: 3975440
    Abstract: Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.
    Type: Grant
    Filed: December 9, 1970
    Date of Patent: August 17, 1976
    Assignee: Hoffmann-La Roche Inc.
    Inventors: Zoltan George Hajos, David Richard Parrish
  • Antioxidant chroman compounds
    Patent number: 3947473
    Abstract: The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
    Type: Grant
    Filed: November 19, 1973
    Date of Patent: March 30, 1976
    Assignee: Hoffman-La Roche Inc.
    Inventors: John William Scott, David Richard Parrish, Gabriel Saucy