Patents by Inventor Hidetoshi Tsumaki

Hidetoshi Tsumaki 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 the preparation of benzyl-metal compounds and process for the preparation of 4-phenyl-1-butenes by the use of the same
    Patent number: 6024897
    Abstract: There is disclosed a method of preparing benzyl metal compounds represented by general formula (2), comprising reacting a phenyl metal compound represented by general formula (1) with toluene, in the presence of a catalytic amount of amine. According to this method, benzyl metal compounds can be prepared at a high yield, and in an industrially advantageous manner. Further, there is also disclosed a method of preparing 4-phenyl-1-butenes, comprising reacting the benzyl metal compound obtained in the method, with an allyl halide. ##STR1## wherein M represents an alkali metal, ##STR2## wherein M has the same meaning as the above.
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: February 15, 2000
    Assignee: K.sup..cndot. I Chemical Industry Co., Ltd.
    Inventors: Hidetoshi Tsumaki, Hidenori Matsuno