Patents by Inventor Toshiko Honda

Toshiko Honda 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).

  • Process for preparing cis-chrysanthemic acid
    Patent number: 3989654
    Abstract: A novel process for preparing cis-chrysanthemic acid comprising (1) hydrolysis of trans-.delta.-halogenodihydrochrysanthemic acid or ester thereof under neutrally kept condition with an alkaline earth metal carbonate, (2) conversion of the obtained trans-.delta.-hydroxydihydrochrysanthemic acid ester into a mixture of cis-chrysanthemic acid and iso-cis-chrysanthemic acid by reacting with a strong base, and (3) separation of the cis-chrysanthemic acid from the mixture by selective conversion of the iso-cis-chrysanthemic acid with water in the presence of an acid catalyst into cis-dihydrochrysanthemolactone, followed by separation of the cis-chrysanthemic acid from the lactone with a caustic alkali and an acid.
    Type: Grant
    Filed: August 23, 1974
    Date of Patent: November 2, 1976
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Toshiko Honda, Nobushige Itaya, Akio Higo, Fukashi Horiuchi