Patents by Inventor Keita Matsushita

Keita Matsushita 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 macrocyclic ketones
    Patent number: 4700007
    Abstract: An improvement in a process for preparing a macrocyclic ketone having from 12 to 18 carbon atoms which comprises intramolecular cyclization of a lower alcohol diester of a straight chain alkanedicarboxylic acid having from 12 to 18 carbon atoms by acyloin condensation and reduction of the resulting 2-hydroxycycloalkanone is disclosed. The improvement comprises conducting the acyloin condensation in a water-immiscible organic solvent having a boiling point of not lower than 40.degree.C., subjecting the resulting organic solvent solution containing the 2-hydroxycycloalkanone to reduction, and conducting the reduction in the copresence of said organic solvent and water. The macrocyclic ketone can be prepared at high efficiency.
    Type: Grant
    Filed: January 31, 1986
    Date of Patent: October 13, 1987
    Assignee: Nippon Mining Co., Ltd.
    Inventors: Hiroshi Okino, Seiichi Uchida, Keita Matsushita