Patents by Inventor Chihliang Chang

Chihliang Chang 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).

  • Organocatalyst
    Patent number: 8008508
    Abstract: The present invention provides an organocatalyst of formula (I), wherein R1 is —H, —OH, —O—Si(R4)(R5)(R6) or C1-6alkoxy, in which R4, R5 and R6 are identical or different and independently selected from the group consisting of C1-6alkyl, phenyl and phenyl substituted with C1-6alkyl; R2 is —OH or ?O; X1 is one selected from the group consisting of —NH—, —S— and X2 is one selected from the group consisting of —C(?O)—, —CH2— and and X1 is different from X2. The high yield and enantioselectivity of an addition reaction are obtained by using the organocatalyst of the present invention.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: August 30, 2011
    Assignee: National Taiwan Normal University
    Inventors: Kwunmin Chen, Ying-Fang Ting, Hsuan-Hao Kuan, Pang-Min Liu, Chihliang Chang
  • ORGANOCATALYST
    Publication number: 20110040104
    Abstract: The present invention provides an organocatalyst of formula (I), wherein R1 is —H, —OH, —O—Si(R4)(R5)(R6) or C1-6alkoxy, in which R4, R5 and R6 are identical or different and independently selected from the group consisting of C1-6alkyl, phenyl and phenyl substituted with C1-6alkyl; R2 is —OH or ?O; X1 is one selected from the group consisting of —NH—, —S— and X2 is one selected from the group consisting of —C(?O)—, —CH2— and and X1 is different from X2. The high yield and enantioselectivity of an addition reaction are obtained by using the organocatalyst of the present invention.
    Type: Application
    Filed: October 30, 2009
    Publication date: February 17, 2011
    Applicant: NATIONAL TAIWAN NORMAL UNIVERSITY
    Inventors: Kwunmin Chen, Ying-Fang Ting, Hsuan-Hao Kuan, Pang-Min Liu, Chihliang Chang