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Sw Zhang - One of the best experts on this subject based on the ideXlab platform.
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Facile synthesis of C-2-symmetric tridentate bis(Thiazoline) and bis(oxazoline) ligands and their application in the enantioselective Henry reaction
tetrahedron asymmetry, 2004Co-Authors: Sw ZhangAbstract:A series of novel C-2-symmetric bis(Thiazoline) ligands with a diphenylamine backbone as a linkage between two Thiazoline rings were synthesized by the use of the simple reagent phosphorus pentasulfide. Their application in the catalytic asymmetric Henry reaction of alpha-keto esters was investigated with comparison to the corresponding bis(oxazoline) ligands. Cu(II)-bis(oxazoline) complexes furnished moderate enantioselectivities (up to 60% ee), while Cu(II)-bis(Thiazoline) complexes gave higher enantioselectivities (up to 70% ee) with neat nitromethane. The enantioselectivity was improved when a halogenated solvent, such as CH2Cl2 was used (up to 82% ee), but the yield obtained lower than that in neat reactions. (C) 2004 Elsevier Ltd. All rights reserved.Chemistry, Inorganic & NuclearChemistry, OrganicChemistry, PhysicalSCI(E)128ARTICLE213433-34411
Shiwei Zhang - One of the best experts on this subject based on the ideXlab platform.
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facile synthesis of c2 symmetric tridentate bis Thiazoline and bis oxazoline ligands and their application in the enantioselective henry reaction
Tetrahedron-asymmetry, 2004Co-Authors: Shiwei ZhangAbstract:Abstract A series of novel C2-symmetric bis(Thiazoline) ligands with a diphenylamine backbone as a linkage between two Thiazoline rings were synthesized by the use of the simple reagent phosphorus pentasulfide. Their application in the catalytic asymmetric Henry reaction of α-keto esters was investigated with comparison to the corresponding bis(oxazoline) ligands. Cu(II)–bis(oxazoline) complexes furnished moderate enantioselectivities (up to 60% ee), while Cu(II)–bis(Thiazoline) complexes gave higher enantioselectivities (up to 70% ee) with neat nitromethane. The enantioselectivity was improved when a halogenated solvent, such as CH2Cl2 was used (up to 82% ee), but the yield obtained lower than that in neat reactions.
Xia Q - One of the best experts on this subject based on the ideXlab platform.
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C-2-symmetric chiral bis(Thiazoline) and bis(oxazoline) ligands and their application in the catalytic asymmetric allylic alkylation
synthesis stuttgart, 2004Co-Authors: Fu B, Xia QAbstract:A series of novel C-2-symmetric bis(Thiazoline) ligands with dibenzo[a,c]cycloheptadiene backbone as the substituent on the Thiazoline ring were synthesized using the simple reagent phosphorus pentasulfide, and their application in catalytic allylic alkylation was investigated by comparison with the corresponding bis(oxazolines). Palladium-bis(oxazoline) complexes furnished good enantioselectivity (up to 87% ee), while bis(Thiazolines) only gave up to moderate enantioselectivity (56% ee) with CH2Cl2 as solvent. Preliminary explanation of the catalysis mechanism is given for the difference of two types of Pd(0)-ligand complexes.Chemistry, OrganicSCI(E)EI34ARTICLE2221-22
Qing Xia - One of the best experts on this subject based on the ideXlab platform.
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C2-Symmetric Chiral Bis(Thiazoline) and Bis(oxazoline) Ligands and their Application in the Catalytic Asymmetric Allylic Alkylation
Synthesis, 2004Co-Authors: Qing XiaAbstract:A series of novel C 2 -symmetric bis(Thiazoline) ligands with dibenzo[a,c]cycloheptadiene backbone as the substituent on the Thiazoline ring were synthesized using the simple reagent phosphorus pentasulfide, and their application in catalytic allylic alkylation was investigated by comparison with the corresponding bis(oxazolines). Palladium-bis(oxazoline) complexes furnished good enantioselectivity (up to 87% ee), while bis(Thiazolines) only gave up to moderate enantioselectivity (56% ee) with CH 2 Cl 2 as solvent. Preliminary explanation of the catalysis mechanism is given for the difference of two types of Pd(0)-ligand complexes.
Eric S. Raper - One of the best experts on this subject based on the ideXlab platform.
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Complexes of heterocyclic thione donors
Coordination Chemistry Reviews, 2001Co-Authors: Eric S. RaperAbstract:Major ligand abbreviations 116 A. Introduction 116 B. General aspects of heterocyclic thione donors 117 C. Complexes of nitrogen containing heterocyclic thiones 121 (i) Pyrrolidine-thiones 121 (ii) 1,3-Imidazoline-2-thiones 121 (iii) Triazoline-thiones 134 (iv) Tetrazoline-thiones 137 (v) Piperidine-thiones 139 (vi) Thiomorpholine-3-thione 141 (vii) c-Thiocaprolactam 142 (viii) Pyridine-thiones 143 (ix) Pyrimidine-thiones 145 (x) Thiouracils and thiocytosines 150 (xi) Purine-thiones 153 (xii) Pyridazine-thiones 154 (xiii) 1,3,5-Triazine-2,4,6-trithione 155 (xiv) Quinoline-8-thione 155 (xv) Quinoxazoline-di-thione 155 D. Complexes of nitrogen and sulphur containing heterocyclic thiones 156 (i) Thiazoline-thiones 156 (ii) Benzo-1,3-Thiazoline-2-thione 156 (iii) 1,3-Thiazolidine-2-thione 161 (iv) 1,3-Thiazolidine-2-thione-5-one 165 (v) 1,2,4-DiThiazoline-3-amino-5-thione 166 (vi) 1,3,4-Thiadiazoline-thiones 167 E. Complexes of nitrogen and oxygen containing heterocyclic thiones 171 (i) 1,3-Oxazolidine-2-thione 171 (ii) Benz-1,3-oxazoline-2-thione 171 (iii) 1,3,4-Oxadiazoline-2-thione 174 F. Complexes of sulphur containing heterocyclic thiones 174 G. Final comments 175 Acknowledgements 176 References 176
