Patents by Inventor Hirokazu Kagano

Hirokazu Kagano 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).

  • Method of producing alkali metal benzenesulfinates
    Patent number: 4849138
    Abstract: A method of producing alkali metal benzenesulfinates having the general formula of ##STR1## wherein M represents Na or K, which comprises: reacting nitrophenylphenyl sulfones having the general formula of ##STR2## wherein n is an integer of 1 or 2, with alkali metal thiophenolates having the general formula of ##STR3## in solvents. The reaction produces also nitrophenylphenyl sulfides as by-products in equimolar amounts to the alkali metal benzenesulfinates, and the oxidation of the sulfides provides the starting nitrophenylphenyl sulfones.A method of producing the nitrophenylphenyl sulfones is also provided wherein the sulfides are oxidized with hydrogen peroxide in the presence both of water-soluble tungstates or molybdates and of phase transfer catalysts in a two-phase heterogeneous solvent.
    Type: Grant
    Filed: August 12, 1987
    Date of Patent: July 18, 1989
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Akira Onoe, Masao Kawamura, Kunioki Kato, Masato Yoshikawa, Hirokazu Kagano