Patents by Inventor Der-Pin Jang

Der-Pin Jang 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 optically active &agr;-hydroxy acids and derivatives thereof
    Patent number: 6639095
    Abstract: The present invention provides a process for preparing optically active &agr;-hydroxy acids and derivatives thereof by subjecting the alkylated 1,3-dioxolanones of formula (IV) wherein R1 and R2 are the same or different and are each independently H or C1-6 alkyl; R5 is H, C1-16 alkyl, or unsubstituted or substituted phenyl; and R6 is C1-8 alkyl, C2-7 alkenyl or unsubstituted or substituted benzyl, to either alcoholysis or hydrolysis, in which the alkylated 1,3-dioxolanones are obtained by using 10-camphorsulfonamide as a chiral auxiliary.
    Type: Grant
    Filed: October 8, 2002
    Date of Patent: October 28, 2003
    Inventors: Biing-Jiun Uang, Jia-Wen Chang, Der-Pin Jang