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Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Inventor:
Zhang; Xumu
Address:
State College, PA
No. of patents:
31
Patents:












Patent Number Title Of Patent Date Issued
7714149 Chiral spiro compounds and their use in asymmetric catalytic reactions May 11, 2010
The present invention provides a chiral ligand, represented by a formula or its enantiomer: ##STR00001## X and X' can be independently O, NH, NR, NCOR or S; each of Z.sub.1-Z.sub.7 and Z.sub.1'-Z.sub.7' can be independently H, alkyl, aryl, substituted alkyl, substituted aryl, alkoxy
7709659 Tetraphosphorus ligands for catalytic hydroformylation and related reactions May 4, 2010
Tetraphosphorous ligands are combined with transition metal salts to form catalysts for use in hydroformylation, isomerization-hydroformylation, hydrocarboxylation, hydrocyan-ation, isomerization-formylation, hydroaminomethylation and similar related reactions.
7589218 Chiral spiro compounds and their use in asymmetric catalytic reactions September 15, 2009
The present invention provides a chiral ligand, represented by a formula or its enantiomer: ##STR00001## X and X' can be independently O, NH, NR, NCOR or S; each of Z.sub.1-Z.sub.7 and Z.sub.1'-Z.sub.7' can be independently H, alkyl, aryl, substituted alkyl, substituted aryl, alkoxy
7538228 Oxazoline ligands for asymmetric catalysis May 26, 2009
A chiral ligand represented by the formula and its enantiomer: ##STR00001## wherein A, X, Y and Z are as defined in the specification is provided. Also provided is a process of making the chiral ligands and catalysts prepared from these ligands and a transition metal, a salt thereof
7531698 Tetraphosphorus ligands for catalytic hydroformylation and related reactions May 12, 2009
Tetraphosphorous ligands are combined with transition metal salts to form catalysts for use in hydroformylation, isomerization-hydroformylation, hydrocarboxylation, hydrocyan-ation, isomerization-formylation, hydroaminomethylation and similar related reactions.
7214813 Preparation of chiral cyclic amino acids and derivatives May 8, 2007
Cyclic .beta.-(acylamino)acrylate derivatives were hydrogenated using Ru-chiral phosphine ligand catalysts and thereafter converted to the corresponding cyclic .beta.-aminoacids in high yield and enantioselectivity according to the reaction scheme: ##STR00001##
7169953 P-chiral phospholanes and phosphocyclic compounds and their use in asymmetric catalytic reaction January 30, 2007
Chiral ligands and metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The metal complexes according to the present invention are useful as catalysts in asymmetric reactions, such as, hydrogenation, hydride transfer, allylic alkylation, hydrosilylat
7153809 P-chiral phospholanes and phosphocyclic compounds and their use in asymmetric catalytic reaction December 26, 2006
Chiral ligands and metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The metal complexes according to the present invention are useful as catalysts in asymmetric reactions, such as, hydrogenation, hydride transfer, allylic alkylation, hydrosilylat
7105702 P-chiral phospholanes and phosphocyclic compounds and their use in asymmetric catalytic reaction September 12, 2006
Chiral ligands and metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The metal complexes according to the present invention are useful as catalysts in asymmetric reactions, such as, hydrogenation, hydride transfer, allylic alkylation, hydrosilylat
6969694 Chiral phosphines, transition metal complexes thereof and uses thereof in asymmetric reactions November 29, 2005
Chiral ligands and transition metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The chiral ligands include (R,S,S,R)-DIOP*. The ruthenium complex reduces enamide to the corresponding amine with up to 99% enantioselectivity. The transition meta
6946569 Asymmetric catalysis based on chiral phospholanes and hydroxyl phospholanes September 20, 2005
Chiral phosphine ligands derived from chiral natural products including D-mannitol and tartaric acid. The ligands contain one or more 5-membered phospholane rings with multiple chiral centers, and provide high stereoselectivity in asymmetric reactions.
6855657 Ortho substituted chiral phosphines and phosphinites and their use in asymmetric catalytic react February 15, 2005
3,3'-Substituted chiral biaryl phosphine and phosphinite ligands and metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The metal complexes are useful as catalysts in asymmetric reactions, such as, hydrogenation, hydride transfer, allylic alkylatio
6828271 Chiral ligands, transition-metal complexes thereof and uses thereof in asymmetric reactions December 7, 2004
Chiral ligands and transition metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The chiral ligands include phospholanes, P,N ligands, N,N ligands, biphenols, and chelating phosphines. The ferrocene-based irridium (R,R)-f-binaphane complex reduces
6727377 Asymmetric catalysis based on chiral phospholanes and hydroxyl phospholanes April 27, 2004
Chiral phosphine ligands derived from chiral natural products including D-mannitol and tartaric acid. The ligands contain one or more 5-membered phospholane rings with multiple chiral centers, and provide high stereoselectivity in asymmetric reactions.
6653485 Ortho substituted chiral phosphines and phosphinites and their use in asymmetric catalytic react November 25, 2003
3,3'-Substituted chiral biaryl phosphine and phosphinite ligands and metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The metal complexes are useful as catalysts in asymmetric reactions, such as, hydrogenation, hydride transfer, allylic alkylatio
6576772 Chiral phosphines, transition metal complexes thereof and uses thereof in asymmetric reactions June 10, 2003
Chiral ligands and transition metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The chiral ligands include (R,S,S,R)-DIOP*. The ruthenium complex reduces enamide to the corresponding amine with up to 99% enantioselectivity. The transition meta
6534657 Chiral ferrocene phosphines and their use in asymmetric catalytic reactions March 18, 2003
Ferrocene anchored chiral ligands and metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The metal complexes according to the present invention are useful as catalysts in asymmetric reactions, such as, hydrogenation, hydride transfer, allylic alkyl
6525210 Chiral ligands, transition-metal complexes thereof and uses thereof in asymmetric reactions February 25, 2003
Chiral ligands and transition metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The chiral ligands include phospholanes, P,N ligands, N,N ligands, biphenols, and chelating phosphines. The ferrocene-based irridium (R,R)-f-binaphane complex reduces
6521769 Chiral phosphines, transition metal complexes thereof and uses thereof in asymmetric reactions February 18, 2003
Chiral ligands and transition metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The chiral ligands include chiral C1-C6 TunaPhos ligands. The ruthenium TunaPhos complex reduces ketones to the corresponding alcohols with 95-99.6% enantioselectivity
6476233 Transition metal-catalyzed reactions based on chiral amine oxazolinyl ligands and related compou November 5, 2002
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 amine oxazolinyl ligands and related ligands. Specially, a direct asymmetric hydrogenation system bas
6451727 Catalysts for use in asymmetric synthesis comprising transition metals and chiral amine oxazolin September 17, 2002
The invention is drawn to transition metal catalysts for the practical synthesis of important chiral molecules. The transition metal catalysts comprise chiral ligands based on chiral amine oxazolinyl ligands. The invention includes methods of making the catalysts, and methods of perf
6399787 Catalytic asymmetric hydrogenation, hydroformylation, and hydrovinylation via transition metal c June 4, 2002
Novel transition metal catalysts with conformationally rigid chiral phosphines and phosphites are developed for asymmetric carbon-hydrogen and carbon--carbon bond formation. The invention emphasizes synthesis of chiral amines, .beta.-amino acids and related compounds via catalytic as
6380416 Asymmetric synthesis catalyzed by transition metal complexes with rigid chiral ligands April 30, 2002
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 conformationa
6380392 Ligands based on chiral 2-amino-2'-hydroxy-1,1'-binaphthyl and related frameworks for asymmetric April 30, 2002
The present invention includes array of new chiral ligands that are optically active or racemic. These ligands are bidentate, tridentate, tetradentate or pentadentate ligands which include P-P, P-N, N-N, mixed P-N, Schiff base or carbene sites. The present invention further includes
6337406 Asymmetric catalysis based on chiral phospholanes and hydroxyl phospholanes January 8, 2002
Chiral phosphine ligands derived from chiral natural products including D-mannitol and tartaric acid. The ligands contain one or more 5-membered phospholane rings with multiple chiral centers, and provide high stereoselectivity in asymmetric reactions.
6278024 Asymmetric synthesis catalyzed by transition metal complexes with rigid chiral ligands August 21, 2001
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 conformationa
6255493 Transition metal-catalyzed reactions based on chiral amine oxazolinyl ligands July 3, 2001
The invention is drawn to transition metal catalysts for the practical synthesis of important chiral molecules. The transition metal catalysts comprise chiral ligands based on chiral amine oxazolinyl ligands. The invention includes methods of making the catalysts, and methods of perf
6207868 Asymmetric synthesis catalyzed by transition metal complexes with chiral ligands March 27, 2001
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 conformationa
6037500 Asymmetric synthesis catalyzed by transition metal complexes with cyclic chiral phosphine ligand March 14, 2000
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
5936127 Asymmetric synthesis and catalysis with chiral heterocyclic compounds August 10, 1999
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 enantiomericall
5767276 Asymmetric synthesis catalyzed by transition metal complexes with new chiral ligands June 16, 1998
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.










 
 
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