Patents by Inventor Nobuchika Tsumagari

Nobuchika Tsumagari 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).

  • Naphthalene derivatives and method for preparation thereof
    Patent number: 4565877
    Abstract: A naphthalene derivative of the formula: ##STR1## wherein R.sup.1 is hydrogen and R.sup.2 is lower alkyl or phenyl-lower alkyl; or R.sup.1 and R.sup.2 are combined together to form lower alkylene; X is halogen; and the absolute configuration at the asymmetric carbon atom shown by the asterisk is either (S)- or (R)-configuration, and a method of preparation thereof are disclosed. Said naphthalene derivative is useful as a chiral reagent for determining the optical purity of an optically active compound containing within its molecule at least one functional group selected from hydroxy, amino and imino groups.
    Type: Grant
    Filed: October 11, 1983
    Date of Patent: January 21, 1986
    Assignee: Tanabe Seiyaku Co., Ltd.
    Inventors: Hiroshi Wada, Kazuhiro Ishii, Nobuchika Tsumagari, Masaaki Matsuo, Mikio Matsumoto