Patents by Inventor Jun Kuwana

Jun Kuwana 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).

  • Patent number: 7994330
    Abstract: It is desirable to provide a method for easily removing catalyst-derived impurities from a product of a reaction by the catalysis of a compound having a dicarboximide skeleton and thereby efficiently yielding a target compound with high purity. Disclosed is a method for producing an organic compound through a reaction of a substrate in the presence of a catalyst, the catalyst including a compound having a dicarboximide skeleton represented by following Formula (i): wherein R represents hydrogen atom or a hydroxyl-protecting group. The method includes the step of treating a reaction product with hot water so as to decompose and remove an impurity derived from the catalyst. The temperature of the hot water is preferably 100° C. or higher.
    Type: Grant
    Filed: March 22, 2006
    Date of Patent: August 9, 2011
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Naruhisa Hirai, Jun Kuwana
  • Patent number: 7910749
    Abstract: A method oxidizes an organic compound with oxygen in the presence of a catalyst, in which the catalyst contains a N-hydroxy- or N-(substituted oxy)-imide compound derivable from at least one selected from a target product, a reaction intermediate, and a reaction byproduct, and the catalyst is produced from at least one component selected from the target product, reaction intermediate, and reaction byproduct each formed as a result of the reaction and is used in the oxidation reaction so as to make up for a loss of the catalyst due to denaturation in the reaction. The method can easily and inexpensively make up for a loss of the catalyst denaturated in the course of reaction.
    Type: Grant
    Filed: February 22, 2006
    Date of Patent: March 22, 2011
    Assignee: Daicel Chemical Industrial, Ltd.
    Inventors: Yasuteru Kajikawa, Naruhisa Hirai, Jun Kuwana
  • Publication number: 20080269507
    Abstract: A method oxidizes an organic compound with oxygen in the presence of a catalyst, in which the catalyst contains a N-hydroxy- or N-(substituted oxy)-imide compound derivable from at least one selected from a target product, a reaction intermediate, and a reaction byproduct, and the catalyst is produced from at least one component selected from the target product, reaction intermediate, and reaction byproduct each formed as a result of the reaction and is used in the oxidation reaction so as to make up for a loss of the catalyst due to denaturation in the reaction. The method can easily and inexpensively make up for a loss of the catalyst denaturated in the course of reaction.
    Type: Application
    Filed: February 22, 2006
    Publication date: October 30, 2008
    Inventors: Yasuteru Kajikawa, Naruhisa Hirai, Jun Kuwana
  • Publication number: 20080171881
    Abstract: It is desirable to provide a method for easily removing catalyst-derived impurities from a product of a reaction by the catalysis of a compound having a dicarboximide skeleton and thereby efficiently yielding a target compound with high purity. Disclosed is a method for producing an organic compound through a reaction of a substrate in the presence of a catalyst, the catalyst including a compound having a dicarboximide skeleton represented by following Formula (i): wherein R represents hydrogen atom or a hydroxyl-protecting group. The method includes the step of treating a reaction product with hot water so as to decompose and remove an impurity derived from the catalyst. The temperature of the hot water is preferably 100° C. or higher.
    Type: Application
    Filed: March 22, 2006
    Publication date: July 17, 2008
    Inventors: Naruhisa Hirai, Jun Kuwana