Patents by Inventor Sambasivarao Kotha

Sambasivarao Kotha 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).

  • Preparation of optically active .alpha.-aryl propionic acids
    Patent number: 5223640
    Abstract: This invention provides a process to prepare optically active .alpha.-aryl propionic acids without the need for resolving a racemic mixture. In one embodiment of the process, an acetophenone is sequentially converted to a 1-alkyne, then to an .alpha.-aryl .beta.-silylated acrolein, and then to an acrylic acid, which is then asymmetrically hydrogenated to an optically active .alpha.-aryl propionic acid.
    Type: Grant
    Filed: December 23, 1992
    Date of Patent: June 29, 1993
    Assignee: Hoechst Celanese Corporation
    Inventors: Ahmed M. Tafesh, Sambasivarao Kotha, Kenneth G. Davenport