Patents by Inventor Shun-Ichi Yamada

Shun-Ichi Yamada 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 preparation of optically pure lactones from monoesters of cis-cyclopentenediol
    Patent number: 4217284
    Abstract: A novel monoester of cis-cyclopentenediol of the following formula ##STR1## wherein ##STR2## is an optically active acyl moiety. The monoester can be prepared by reacting cis-2-cyclopentene-1,4-diol with an optically active carboxylic acid of the following formula ##STR3## wherein ##STR4## is the same as defined above, or its reactive derivative, and separating the resulting reaction product into the two individual diastereomers. Lactones can be prepared from the monoesters selectively and with commercial advantage.
    Type: Grant
    Filed: June 30, 1978
    Date of Patent: August 12, 1980
    Assignee: Kowa Company Ltd.
    Inventors: Shun-ichi Yamada, Shiro Terashima, Masahiko Nagakura, Munehiko Nara
  • Novel monoesters of cis-cyclopentenediol, process for preparation thereof, and process for preparation of lactones from the monoesters
    Patent number: 4170596
    Abstract: A novel monoester of cis-cyclopentenediol of the following formula ##STR1## wherein ##STR2## is an optically active acyl moiety. The monoester can be prepared by reacting cis-2-cyclopentene-1,4-diol with an optically active carboxylic acid of the following formula ##STR3## wherein ##STR4## is the same as defined above, or its reactive derivative, and separating the resulting reaction product into the two individual diastereomers. Lactones can be prepared from the monoesters selectively and with commercial advantage.
    Type: Grant
    Filed: October 4, 1977
    Date of Patent: October 9, 1979
    Assignee: Kowa Company, Ltd.
    Inventors: Shun-Ichi Yamada, Shiro Terashima, Masahiko Nagakura, Munehiko Nara