Patents by Inventor Shunich Maemoto

Shunich Maemoto 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).

  • Chemical modification method of diastereomer and separation method thereof
    Patent number: 5223647
    Abstract: The present invention discloses a separating and purifying (4R, 6R)-4-hydroxy-2,2,6-trimethyl cyclohexanone comprising the steps of:reacting a diastereomer mixture of (4R, 6R)-4-hydroxy-2,2,6-trimethyl cyclohexanone represented by the formula (I) ##STR1## and (4S, 6R)-4-hydroxy-2,2,6-trimethyl cyclohexanone represented by the formula (II) ##STR2## with a reagent which reacts with the hydroxyl groups at least equimolar to the compound represented by the formula (II) to thereby convert the compound represented by the formula (II) into (4S, 6R)-4-hydroxy-2,2,6-trimethyl cyclohexanone derivative represented by the formula (III) ##STR3## (where R represents a group modifying the hydroxyl group) by modification with priority of the hydroxyl group in the formula (II), andseparating the compound of the formula (I) from the compound of the formula (III) through the difference in solubility to water or an organic solvent.
    Type: Grant
    Filed: June 23, 1992
    Date of Patent: June 29, 1993
    Assignee: Kanegafuchi Kagaku Kogyo Kabushiki Kaisha
    Inventors: Shunich Maemoto, Akira Iwasaki, Junzo Hasegawa