Patents by Inventor Takayuk Higashii

Takayuk Higashii 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 preparing 1-bromoalkylbenzene derivatives and intermediates thereof
    Patent number: 6063940
    Abstract: A 1-bromoalkylbenzene derivative is prepared by reacting a phenylalkene derivative with hydrogen bromide in the presence of a non-polar solvent. The phenylalkene derivative is prepared by reacting an alkenyl halide with metal magnesium to form a Grignard reagent, and then reacting the Grignard reagent with a benzyl halide derivative. An allyl Grignard reagent is prepared by reacting continuously an allyl halide derivative with metal magnesium in an organic solvent, in which the allyl halide derivative and metal magnesium are continuously added to the reaction system and the allyl Grignard reagent formed is continuously removed from the reaction system. The processes provide the intended compounds in high yields, high selectivities and high purities.
    Type: Grant
    Filed: February 13, 1997
    Date of Patent: May 16, 2000
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Hiroaki Fujishima, Yasunobu Miyamoto, Masayoshi Minai, Tsutomu Matsumoto, Hideki Ushio, Takayuk Higashii