Patents Assigned to Otsuka Kagaku Yakuhin Kabushiki Kaishi
  • Process for preparing 3-oxy-4H-pyran-4-one derivatives
    Patent number: 4059595
    Abstract: A process for preparing a 3-oxy-4H-pyran-4-one derivative which comprises the steps of:1. epoxidizing a 3-oxo-3,6-dihydro-2H-pyran derivative with a peroxide to obtain a 4,5-epoxy-3-oxotetrahydropyran derivative, and2. heating the 4,5-epoxy-3-oxotetrahydropyran derivative.
    Type: Grant
    Filed: February 26, 1976
    Date of Patent: November 22, 1977
    Assignee: Otsuka Kagaku Yakuhin Kabushiki Kaishi
    Inventors: Tatsuya Shono, Yoshihiro Matsumura