Patents by Inventor Xumu Zhang

Xumu Zhang 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).

  • Asymmetric synthesis catalyzed by transition metal complexes with chiral ligands
    Patent number: 6207868
    Abstract: This invention is to develop novel transition metal catalysts for the practical synthesis of important chiral molecules. The invention emphasizes asymmetric catalysis based on chiral bidentate phosphine ligands with cyclic ring structures which could be used to restrict conformational flexibility of the ligands and thus the efficiency of chiral transfer can be enhanced through the ligand rigidity.
    Type: Grant
    Filed: November 12, 1998
    Date of Patent: March 27, 2001
    Assignee: The Penn State Research Foundation
    Inventor: Xumu Zhang
  • Asymmetric synthesis catalyzed by transition metal complexes with cyclic chiral phosphine ligands
    Patent number: 6037500
    Abstract: The present invention relates to rigid chiral ligands usefull in making catalysts for asymmetric synthesis. More particularly, the present invention relates to new monodentate and bidentate cyclic chiral phosphine ligands which are formed into catalysts to provide high selectivity of the enantiomeric structure of the end-product.
    Type: Grant
    Filed: June 13, 1997
    Date of Patent: March 14, 2000
    Assignee: The Penn State Research Foundation
    Inventor: Xumu Zhang
  • Asymmetric synthesis and catalysis with chiral heterocyclic compounds
    Patent number: 5936127
    Abstract: This invention relates to chiral heterocyclic compounds useful for asymmetric synthesis and catalysis. More particularly, the invention relates to chiral heterocyclic phosphine, sulfur, and nitrogen compounds for asymmetric synthesis and catalysis in the production of enantiomerically pure products.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: August 10, 1999
    Assignee: The Penn State Research Foundation
    Inventor: Xumu Zhang
  • Asymmetric synthesis catalyzed by transition metal complexes with new chiral ligands
    Patent number: 5767276
    Abstract: A chiral ligand having the following structure: ##STR1## wherein AR is any aromatic and/or ring structure, and R is selected from the group consisting of aryl, oxygenated aryl, alkyl, oxygenated alkyl, AR, oxygenated AR and combinations thereof.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: June 16, 1998
    Assignee: The Penn State Research Foundation
    Inventor: Xumu Zhang
  • Tetraphenylporphyrin compounds and method
    Patent number: 5384397
    Abstract: The invention includes a water-soluble oxygen carrier. The oxygen carrier includes a meso-.alpha.,.alpha.,.alpha.,.alpha.-tetrakis(o-propanoylamino)phenylporph yrin, in which the 3-carbons of the propanoyl groups are each covalently bound to an amine nitrogen, and iron or cobalt is bound to the pyrrole nitrogens of the porphyrin. The oxygen carrier also includes a ligand L for protecting the open face of the porphyrin from .mu.-oxo dimer formation.
    Type: Grant
    Filed: November 9, 1993
    Date of Patent: January 24, 1995
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Xumu Zhang, Erich Uffelman, James P. Collman
  • Tetraphenylporphyrin compounds and method
    Patent number: 5274090
    Abstract: Disclosed is a metalloporphyrin-ligand complex which includes (a) a meso-tetraphenylporphyrin, (b) a crown ether rigidly attached to the meso-tetraphenylporphyrin by covalent attachment on one side of the porphyrin to two diagonally opposing phenyl groups, (c) a metal bound to the pyrrole nitrogens of the porphyrin, (d) a bridge covalently linking two diagonally opposing phenyl groups on the other side of the porphyrin, effective to hinder .mu.-oxo diner formation, and (e) a ligand having (i) a primary amine which is held noncovalently by the crown ether and (ii) a metal-coordinating atom which is coordinately bound to the metal.In another aspect, the invention includes a water-soluble oxygen carrier. The oxygen carrier includes a meso-.alpha.,.alpha.,.alpha.,.alpha.-tetrakis(o-propanoylamino)phenylporph yrin, in which the 3-carbons of the propanoyl groups are each covalently bound to a quaternary amine, and iron or cobalt is bound to the pyrrole nitrogens of the porphyrin.
    Type: Grant
    Filed: November 9, 1992
    Date of Patent: December 28, 1993
    Assignee: The Board of Trustees of the Leland Stanford Junior University
    Inventors: Xumu Zhang, Erich S. Uffelman, James P. Collman