Patents by Inventor Cilien S. Hanna

Cilien S. Hanna 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).

  • Processes for the 3,3-dialkylation of 4-chromanones
    Patent number: 7671220
    Abstract: The present invention relates to methods for the preparation of 3,3-dialky 4-chromanones, and particularly to the preparation of 6-fluoro-3,3-dimethyl-2,3-dihydro-4H-chromen-4-one and 3,3-dimethyl-2,3-dihydro-4H-chromen-4-one. In some embodiments, the processes include reaction of a 4-chromanone compound with an alkyl halide in the presence of a metal alkoxide at low temperature.
    Type: Grant
    Filed: February 15, 2006
    Date of Patent: March 2, 2010
    Assignee: Wyeth
    Inventors: Ayako Yamashita, Emily B. Norton, Jaechul Shim, Cilien S. Hanna