Patents by Inventor Dora E. Rios

Dora E. Rios 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).

  • Use of 4-substituted 2-butanones to prepare nabumetone
    Patent number: 5600009
    Abstract: The palladium-catalyzed coupling of aryl and vinyl halides with vinylic compounds is disclosed. A preferred embodiment relating to the palladium catalyzed coupling of 4-substituted and 6-substituted-2-methoxynaphthalene to form nabumetone is also disclosed. The beauty of this novel reaction is that methylvinylketone, normally employed by the art directly as-is for the preparation of nabumetone, is formed in situ. We have discovered a mechanism to take advantage of the in situ formation of methylvinylketone, thus avoiding the use of expensive, toxic, and unstable methyl vinyl ketone feed. This reaction may be employed for a variety of pharmaceutically active and non-pharmaceutical compounds.
    Type: Grant
    Filed: April 9, 1996
    Date of Patent: February 4, 1997
    Assignee: Hoechst Celanese Corporation
    Inventors: John F. Fritch, Mohammad Aslam, Dora E. Rios, Joel C. Smith