The Experts below are selected from a list of 141 Experts worldwide ranked by ideXlab platform
Chu-chieh Lin - One of the best experts on this subject based on the ideXlab platform.
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Comparative study of lactide polymerization by zinc alkoxide complexes with a β-diketiminato ligand bearing different substituents
Journal of Molecular Catalysis A-chemical, 2011Co-Authors: Hsuan-ying Chen, Ya-liu Peng, Tai-hsiung Huang, Alekha Kumar Sutar, Stephen A. Miller, Chu-chieh LinAbstract:Abstract A series of β-diketiminate zinc complexes has been synthesized and their reactivity for the ring-opening polymerization (ROP) of lactide has been studied. The reaction of β-diketimines (LH) with diethyl zinc forms the monomeric [LZnEt] complexes which further react with benzyl alcohol (BnOH) in toluene/hexane yielding dinuclear or trinuclear zinc complexes. These complexes have been characterized by single crystal X-ray diffraction, which showed the tri- and tetra-coordinated zinc complexes in which zinc atoms exhibit trigonal and tetrahedral geometry, respectively. All complexes have been tested as initiators for the ring-opening polymerization of lactide; they are all highly active. The rate of polymerization is heavily dependent on the N-aryl substituents with the order: alkyl Group ∼ alkoxy > Halide Group > nitro Group. The β-diketiminate zinc complexes allow controlled ring-opening polymerization as shown by the linear relationship between the percentage conversion and the number-average molecular weight. On the basis of literature reports, a mechanism for ROP of lactide has been proposed.
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Comparative study of lactide polymerization by zinc alkoxide complexes with a β-diketiminato ligand bearing different substituents
Journal of Molecular Catalysis A: Chemical, 2011Co-Authors: Hsuan-ying Chen, Ya-liu Peng, Tai-hsiung Huang, Alekha Kumar Sutar, Stephen A. Miller, Chu-chieh LinAbstract:A series of beta-diketiminate zinc complexes has been synthesized and their reactivity for the ring-opening polymerization (ROP) of lactide has been studied. The reaction of beta-diketimines (LH) with diethyl zinc forms the monomeric [LZnEt] complexes which further react with benzyl alcohol (BnOH) in toluene/hexane yielding dinuclear or trinuclear zinc complexes. These complexes have been characterized by single crystal X-ray diffraction, which showed the tri- and tetra-coordinated zinc complexes in which zinc atoms exhibit trigonal and tetrahedral geometry, respectively. All complexes have been tested as initiators for the ring-opening polymerization of lactide: they are all highly active. The rate of polymerization is heavily dependent on the N-aryl substituents with the order: alkyl Group similar to alkoxy > Halide Group > nitro Group. The beta-diketiminate zinc complexes allow controlled ring-opening polymerization as shown by the linear relationship between the percentage conversion and the number-average molecular weight. On the basis of literature reports, a mechanism for ROP of lactide has been proposed. (C) 2011 Elsevier B.V. All rights reserved
Qing Yang - One of the best experts on this subject based on the ideXlab platform.
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stereoselective synthesis of phenyl 1 2 3 triazoles containing e vinyl Halide Group via a one pot three component reaction
ChemInform, 2011Co-Authors: Wensheng Zhang, Chunxiang Kuang, Qing YangAbstract:Two examples are given, where NCS and NIS are used, resulting in the corresponding vinyl chloro and vinyl iodo derivatives, respectively.
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Stereoselective Synthesis of Phenyl‐1,2,3‐triazoles Containing (E)‐Vinyl Halide Group via a One‐Pot, Three‐Component Reaction.
ChemInform, 2011Co-Authors: Wensheng Zhang, Chunxiang Kuang, Qing YangAbstract:Two examples are given, where NCS and NIS are used, resulting in the corresponding vinyl chloro and vinyl iodo derivatives, respectively.
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Stereoselective Synthesis of Phenyl-1,2,3-triazoles Containing (E)-Vinyl Halide Group via a One-Pot, Three-Component Reaction
Synthetic Communications, 2011Co-Authors: Wensheng Zhang, Chunxiang Kuang, Qing YangAbstract:Abstract Phenyl-1,2,3-triazoles containing (E)-vinyl Halide were readily synthesized via a one-pot, three-component reaction of 3-(4- or 2-azidophenyl)acrylic acid, NXS(X=Cl, Br and I) and 1-alkynes in MeCN-H2O (9:1 v/v) catalyzed by LiOAc/CuI–sodium ascorbate system.
Wei Yongge - One of the best experts on this subject based on the ideXlab platform.
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Tosylation of alcohols: an effective strategy for the functional Group transformation of organic derivatives of polyoxometalates
SCIENTIFIC REPORTS, 2017Co-Authors: Jia Hongli, Bayaguud Aruuhan, She Shan, Huang Yichao, Chen Kun, Wei YonggeAbstract:Recently, the organic functionalization of polyoxometalates (POMs) has drawn increasing interest, and an easy and effective route to achieve organic derivatives is of great importance. Herein, the first reported synthesis of a tosyl ester derivative of the polyoxometalate (Bu4N)(2)[V6O13{(OCH2)(3)CCH2SO3C7H4}(2)].2.5CH(3)CN (compound 1) was performed by using DMAP as an activating reagent and triethylamine as an HCl scavenger. The tosyl ester was transformed into an azide or Halide Group by using sodium azide or sodium bromide, respectively, as the nucleophilic agent. Two derivatives of POMs, (Bu4N)(2)[V6O13{(OCH2)(3)CCH2N3}(2)].4CH(3)CN (compound 2) and (Bu4N)(2)[V6O13{(OCH2)(3)CCH2Br}(2)] (compound 3), were easily obtained. All the compounds were structurally and compositionally characterized by single-crystal X-ray diffraction, elemental analysis, IR spectroscopy, NMR spectroscopy, ESI-MS, UV-Vis spectroscopy and TGA. This work provides a new route for the functional Group transformation of organic derivatives of polyoxometalates.National Natural Science Foundation of China (NSFC) [21225103, 21631007, 21471087]; Higher Education of China; Beijing Natural Science Foundation [2164063]; Tsinghua University Initiative Foundation (THSJZ) [20131089204]; State Key Laboratory of Natural and Biomimetic Drugs [K20160202]SCI(E)ARTICLE
Hsuan-ying Chen - One of the best experts on this subject based on the ideXlab platform.
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Comparative study of lactide polymerization by zinc alkoxide complexes with a β-diketiminato ligand bearing different substituents
Journal of Molecular Catalysis A-chemical, 2011Co-Authors: Hsuan-ying Chen, Ya-liu Peng, Tai-hsiung Huang, Alekha Kumar Sutar, Stephen A. Miller, Chu-chieh LinAbstract:Abstract A series of β-diketiminate zinc complexes has been synthesized and their reactivity for the ring-opening polymerization (ROP) of lactide has been studied. The reaction of β-diketimines (LH) with diethyl zinc forms the monomeric [LZnEt] complexes which further react with benzyl alcohol (BnOH) in toluene/hexane yielding dinuclear or trinuclear zinc complexes. These complexes have been characterized by single crystal X-ray diffraction, which showed the tri- and tetra-coordinated zinc complexes in which zinc atoms exhibit trigonal and tetrahedral geometry, respectively. All complexes have been tested as initiators for the ring-opening polymerization of lactide; they are all highly active. The rate of polymerization is heavily dependent on the N-aryl substituents with the order: alkyl Group ∼ alkoxy > Halide Group > nitro Group. The β-diketiminate zinc complexes allow controlled ring-opening polymerization as shown by the linear relationship between the percentage conversion and the number-average molecular weight. On the basis of literature reports, a mechanism for ROP of lactide has been proposed.
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Comparative study of lactide polymerization by zinc alkoxide complexes with a β-diketiminato ligand bearing different substituents
Journal of Molecular Catalysis A: Chemical, 2011Co-Authors: Hsuan-ying Chen, Ya-liu Peng, Tai-hsiung Huang, Alekha Kumar Sutar, Stephen A. Miller, Chu-chieh LinAbstract:A series of beta-diketiminate zinc complexes has been synthesized and their reactivity for the ring-opening polymerization (ROP) of lactide has been studied. The reaction of beta-diketimines (LH) with diethyl zinc forms the monomeric [LZnEt] complexes which further react with benzyl alcohol (BnOH) in toluene/hexane yielding dinuclear or trinuclear zinc complexes. These complexes have been characterized by single crystal X-ray diffraction, which showed the tri- and tetra-coordinated zinc complexes in which zinc atoms exhibit trigonal and tetrahedral geometry, respectively. All complexes have been tested as initiators for the ring-opening polymerization of lactide: they are all highly active. The rate of polymerization is heavily dependent on the N-aryl substituents with the order: alkyl Group similar to alkoxy > Halide Group > nitro Group. The beta-diketiminate zinc complexes allow controlled ring-opening polymerization as shown by the linear relationship between the percentage conversion and the number-average molecular weight. On the basis of literature reports, a mechanism for ROP of lactide has been proposed. (C) 2011 Elsevier B.V. All rights reserved
Wensheng Zhang - One of the best experts on this subject based on the ideXlab platform.
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stereoselective synthesis of phenyl 1 2 3 triazoles containing e vinyl Halide Group via a one pot three component reaction
ChemInform, 2011Co-Authors: Wensheng Zhang, Chunxiang Kuang, Qing YangAbstract:Two examples are given, where NCS and NIS are used, resulting in the corresponding vinyl chloro and vinyl iodo derivatives, respectively.
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Stereoselective Synthesis of Phenyl‐1,2,3‐triazoles Containing (E)‐Vinyl Halide Group via a One‐Pot, Three‐Component Reaction.
ChemInform, 2011Co-Authors: Wensheng Zhang, Chunxiang Kuang, Qing YangAbstract:Two examples are given, where NCS and NIS are used, resulting in the corresponding vinyl chloro and vinyl iodo derivatives, respectively.
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Stereoselective Synthesis of Phenyl-1,2,3-triazoles Containing (E)-Vinyl Halide Group via a One-Pot, Three-Component Reaction
Synthetic Communications, 2011Co-Authors: Wensheng Zhang, Chunxiang Kuang, Qing YangAbstract:Abstract Phenyl-1,2,3-triazoles containing (E)-vinyl Halide were readily synthesized via a one-pot, three-component reaction of 3-(4- or 2-azidophenyl)acrylic acid, NXS(X=Cl, Br and I) and 1-alkynes in MeCN-H2O (9:1 v/v) catalyzed by LiOAc/CuI–sodium ascorbate system.
