Patents by Inventor Seinosuke Otsuka

Seinosuke Otsuka 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 enamines or imines
    Patent number: 4695631
    Abstract: A process for the preparation of enamines or imines by isomerization of allylamine derivatives is described. Allylamine derivatives represented by formula (I): ##STR1## are isomerized using as a catalyst a rhodium complex represented by formula (IV):[Rh(olefin)L].sup.+ X.sup.- (IV)to form enamines or imines represented by, respectively, formula (II) or formula (III): ##STR2## All of the symbols in the above formulae are as described. These enamines or imines are useful intermediates for the preparation of a number of organic compounds.
    Type: Grant
    Filed: June 30, 1982
    Date of Patent: September 22, 1987
    Assignee: Takasago Perfumery Co., Ltd.
    Inventors: Seinosuke Otsuka, Kazuhide Tani, Tsuneaki Yamagata, Susumu Akutagawa, Hidenori Kumobayashi, Misao Yagi