Patents by Inventor Takanao Tarui

Takanao Tarui 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 producing 4-substituted benzopyran derivatives
    Patent number: 6608217
    Abstract: The present invention relates to a first process for producing a 2,2-bis(fluoromethyl)-6-(perfluoroalkyl)-2H-1-benzopyran-4-carboxylic acid. The first process includes the steps of (a) reacting a 2,2-bis(fluoromethyl)-6-(perfluoroalkyl)-2H-1-benzopyran-4-one with a perfluoroalkanesulfonic acid anhydride in the presence of a base, thereby obtaining a perfluoroalkanesulfonic 2,2-bis(fluoromethyl)-6-(perfluoroalkyl)-2H- 1-benzopyran-4-yl ester; and (b) reacting the benzopyranyl ester with carbon monoxide in the presence of a palladium complex compound and a base, thereby obtaining the carboxylic acid. The present invention further relates to a second process for producing a 2-hydroxy-5-(perfluoroalkyl) acetophenone, which can be a raw material for producing the carboxylic acid.
    Type: Grant
    Filed: September 26, 2002
    Date of Patent: August 19, 2003
    Assignee: Central Glass Company, Limited
    Inventors: Takeo Komata, Masaki Fujiwara, Takanao Tarui, Yusuke Saito, Hiroshi Minesaki
  • Process for producing 4-substituted benzopyran derivatives
    Publication number: 20030109574
    Abstract: The present invention relates to a first process for producing a 2,2-bis(fluoromethyl)-6-(perfluoroalkyl)-2H-1-benzopyran-4-carboxylic acid. The first process includes the steps of (a) reacting a 2,2-bis(fluoromethyl)-6-(perfluoroalkyl)-2H-1-benzopyran-4-one with a perfluoroalkanesulfonic acid anhydride in the presence of a base, thereby obtaining a perfluoroalkanesulfonic 2,2-bis(fluoromethyl)-6-(perfluoroalkyl)-2H-1-benzopyran-4-yl ester; and (b) reacting the benzopyranyl ester with carbon monoxide in the presence of a palladium complex compound and a base, thereby obtaining the carboxylic acid. The present invention further relates to a second process for producing a 2-hydroxy-5-(perfluoroalkyl)acetophenone, which can be a raw material for producing the carboxylic acid.
    Type: Application
    Filed: September 26, 2002
    Publication date: June 12, 2003
    Applicant: Central Glass Company, Limited
    Inventors: Takeo Komata, Masaki Fujiwara, Takanao Tarui, Yusuke Saito, Hiroshi Minesaki