Patents by Inventor To Liu

To Liu 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).

  • Aminothiol compound
    Patent number: 7335781
    Abstract: The present invention discloses an aminothiol compound having a general formula I wherein R1-R5 are substitutable ligands. Such compound can perform as a superior catalyst in an asymmetric addition reaction of organic metal compounds and aldehyde. According to the present invention, the aminothiol compound is needed only less than 0.02% based on main reactants to obtain enantioselectivity higher than 98% enantiomeric excess, whereby the asymmetric reactions can become very economic.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: February 26, 2008
    Assignee: Huey Jiin Co., Ltd.
    Inventors: Teng-Kuei Yang, Shi-Liang Tseng, To Liu, Nan-Kuang Chen
  • Acylated aminothiol compound
    Patent number: 6965038
    Abstract: The present invention discloses an acylated derivative of an aminothiol compound having a general formula II wherein R1-R4 and R6 are substitutable ligands. Such compounds can perform as superior catalysts in asymmetric addition reactions of organic zinc and aldehyde. According to the present invention, only less than 0.02% of the acylated derivative is needed to obtain high enantioselectivity over 99% enantiomeric excess.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: November 15, 2005
    Assignee: National Chung-Hsing University
    Inventors: Teng-Kuei Yang, Nan-Kuang Chen, To Liu
  • Aminothiol compound
    Patent number: 6861536
    Abstract: The present invention discloses an aminothiol compound having a general formula I wherein R1-R5 are substitutable ligands. Such compounds can perform as superior catalysts in asymmetric addition reactions of organic zinc and aldehyde. According to the present invention, the compounds is needed only less than 0.02% of main reactants to obtain enantioselectivity higher than 99% enantiomeric excess, whereby the asymmetric reactions can become very economic.
    Type: Grant
    Filed: January 8, 2002
    Date of Patent: March 1, 2005
    Assignee: National Chung-Hsing University
    Inventors: Teng-Kuei Yang, Nan-Kuang Chen, To Liu
  • Aminothiol compound
    Publication number: 20040181057
    Abstract: The present invention discloses an aminothiol compound having a general formula I wherein R1-R5 are substitutable ligands. Such compound can perform as a superior catalyst in an asymmetric addition reaction of organic metal compounds and aldehyde. According to the present invention, the aminothiol compound is needed only less than 0.02% based on main reactants to obtain enantioselectivity higher than 98% enantiomeric excess, whereby the asymmetric reactions can become very economic.
    Type: Application
    Filed: March 23, 2004
    Publication date: September 16, 2004
    Inventors: Teng-Kuei Yang, Shi-Liang Tseng, To Liu, Nan-Kuang Chen
  • Acylated aminothiol compound
    Publication number: 20040049033
    Abstract: The present invention discloses an acylated derivative of an aminothiol compound having a general formula II wherein R1-R4 and R6 are substitutable ligands. Such compounds can perform as superior catalysts in asymmetric addition reactions of organic zinc and aldehyde. According to the present invention, only less than 0.02% of the acylated derivative is needed to obtain high enantioselectivity over 99% enantiomeric excess.
    Type: Application
    Filed: August 26, 2003
    Publication date: March 11, 2004
    Inventors: Teng-Kuei Yang, Nan-Kuang Chen, To Liu
  • AMINOTHIOL COMPOUNDS AND ACYLATED DERIVATIVES THEREOF
    Publication number: 20030153781
    Abstract: The present invention discloses aminothiol compounds and acylated derivatives thereof, which respectively have general formula I and formula II wherein R1-R6 are substitutable ligands. Such compounds can perform as superior catalysts in asymmetric addition reactions of organic zinc and aldehyde. According to the present invention, the compounds is needed only less than 0.02% of main reactants to obtain enantioselectivity higher than 99% enantiomeric excess, whereby the asymmetric reactions can become very economic.
    Type: Application
    Filed: January 8, 2002
    Publication date: August 14, 2003
    Inventors: Teng-Kuei Yang, Nan-Kuang Chen, To Liu