1
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Kim J, Kim H. Chiral Discrimination of Monosaccharides Derivatized with 2-Fluorophenyl Hydrazine Using 19F NMR Spectroscopy. Anal Chem 2023; 95:17726-17732. [PMID: 37984461 DOI: 10.1021/acs.analchem.3c03586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
Chiral discrimination of monosaccharides holds significant importance, especially given the growing interest of the pharmaceutical industry in their utilization. However, the majority of existing methods has predominantly centered around chromatographic techniques. In this study, we introduce a 19F NMR-based comprehensive approach for chiral analysis specifically tailored for 15 pairs of aldoses. This technique involves employing sugar hydrazones containing fluorine in combination with chiral octahedral gallium and scandium complexes. By utilizing highly sensitive 19F NMR spectroscopy, the fluorine label in the sugar hydrazone enables accurate differentiation between d and l enantiomers. The efficiency of the newly developed method was demonstrated through its successful application in both quantitative and qualitative analyses of mixtures containing various monosaccharides.
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Affiliation(s)
- Jumi Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Hyunwoo Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
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2
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Gu G, Yue Y, Wang C, Zhang W, Wu J, Li Y, Zhao Y. Chiral Discrimination of Nitrile Compounds Using a 19F-Labeled Palladium Probe. Org Lett 2023. [PMID: 37378527 DOI: 10.1021/acs.orglett.3c01525] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2023]
Abstract
This study presents a 19F-labeled cyclopalladium probe for the rapid discrimination of chiral nitriles in pharmaceuticals, natural products, and agrochemicals. The probe binds reversibly to chiral nitriles, generating distinct 19F nuclear magnetic resonance signals for each enantiomer and enabling quick determination of enantiocomposition. The method allows for simultaneous detection of seven pairs of enantiomeric nitriles and application in assessing the enantiomeric excess of an asymmetric C-H cyanation reaction.
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Affiliation(s)
- Guangxing Gu
- College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, People's Republic of China
| | - Yue Yue
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, People's Republic of China
| | - Chenyang Wang
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, People's Republic of China
| | - Wei Zhang
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, People's Republic of China
| | - Jian Wu
- Instrumental Analysis Center, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, People's Republic of China
| | - Ya Li
- College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Road, Shanghai 201620, People's Republic of China
| | - Yanchuan Zhao
- Key Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, People's Republic of China
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3
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Kwahk EJ, Nguyen NH, Jang S, Shin S, Kim H. Chiral Recognition and Resolution of Phosphoric Acids Using Octahedral Cobalt Complexes. Org Lett 2023; 25:2036-2040. [PMID: 36926952 DOI: 10.1021/acs.orglett.3c00384] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
Determining the chirality of phosphoric acids can be a challenging task. In this study, we present a novel approach for the chiral recognition of phosphates using cationic octahedral cobalt complexes. By utilizing 31P NMR spectroscopy, we are able to accurately measure the enantiopurities of chiral phosphoric acids after forming ion pairs with the cobalt complexes. We have successfully applied this method to a variety of chiral phosphoric acids derived from BINOL, H8-BINOL, SPINOL, VAPOL, and VANOL compounds, as well as ATP, and were able to efficiently resolve them in 31P{1H} NMR spectra. Furthermore, we were able to achieve an optical resolution of a phosphoric acid with an enantiomeric excess of greater than 99%.
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Affiliation(s)
- Eun-Jeong Kwahk
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Nguyen H Nguyen
- Department of Chemistry, Hanyang University, Seoul 04763, Korea
| | - Sumin Jang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Seunghoon Shin
- Department of Chemistry, Hanyang University, Seoul 04763, Korea
| | - Hyunwoo Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
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4
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Chiral tetraalkynylborate as a chiral solvating agent for N-chiral tetraalkylammonium salts. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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5
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Yen YT, Tseng SH, Huang DY, Tsai YS, Lee LW, Chen PL, Liu YL, Chyueh SC. Identification of a novel norketamine precursor from seized powders: 2-(2-chlorophenyl)-2-nitrocyclohexanone. Forensic Sci Int 2022; 333:111241. [DOI: 10.1016/j.forsciint.2022.111241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 02/19/2022] [Accepted: 02/22/2022] [Indexed: 11/04/2022]
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6
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Zhang X, Xu J, Sun Z, Bian G, Song L. NMR analysis of the enantiomeric purity of chiral diols by a new chiral boron agent. RSC Adv 2022; 12:4692-4696. [PMID: 35425523 PMCID: PMC8981704 DOI: 10.1039/d2ra00428c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Accepted: 02/01/2022] [Indexed: 11/21/2022] Open
Abstract
A new boric agent with bridged structure, boric acid D, was first synthesized and used as an excellent chiral derivative agent for highly efficient enantiodiscrimination of various diols.
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Affiliation(s)
- Xuebo Zhang
- College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, China
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
| | - Jing Xu
- College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, China
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
| | - Zhaofeng Sun
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
| | - Guangling Bian
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
| | - Ling Song
- The Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, China
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7
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Jang S, Park H, Duong QH, Kwahk EJ, Kim H. Determining the Enantiomeric Excess and Absolute Configuration of In Situ Fluorine-Labeled Amines and Alcohols by 19F NMR Spectroscopy. Anal Chem 2021; 94:1441-1446. [PMID: 34949084 DOI: 10.1021/acs.analchem.1c04834] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The determination of the enantiomeric excess and absolute configuration of chiral compounds is indispensable in synthetic, pharmaceutical, and biological chemistry. In this article, we describe an efficient 19F nuclear magnetic resonance (NMR)-based analytical protocol for determining the enantiomeric excess and absolute configuration of in situ fluorine-labeled amines and alcohols. 2-Fluorobenzoylation was used to convert analytes to fluorinated amides or esters. The resulting F-labeled analytes were mixed with a cationic cobalt(III) complex, [Co]BArF, resulting in clean baseline peak separations of analyte enantiomers in 19F{1H} NMR spectra. The measured ΔδRS signs were unambiguously used to correlate the absolute configurations of amines, amino alcohols, and alcohols. Moreover, the structure-dependent 19F{1H} NMR signals enabled absolute configuration determination by analyzing the relative chemical shifts of enantiopure analyte samples with [Co]BArF and ent-[Co]BArF.
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Affiliation(s)
- Sumin Jang
- Department of Chemistry, Korea Advanced Instituted of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Hahyoun Park
- Department of Chemistry, Korea Advanced Instituted of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Quynh Huong Duong
- Department of Chemistry, Korea Advanced Instituted of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Eun-Jeong Kwahk
- Department of Chemistry, Korea Advanced Instituted of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Hyunwoo Kim
- Department of Chemistry, Korea Advanced Instituted of Science and Technology (KAIST), Daejeon 34141, Korea
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8
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Kwahk EJ, Jang S, Kim H. Chiral Recognition of In Situ-Oxidized Phosphine Oxides with Octahedral Indium Complexes by 31P NMR Spectroscopy. Org Lett 2021; 23:7829-7833. [PMID: 34559535 DOI: 10.1021/acs.orglett.1c02847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, efficient chiral recognition of phosphine oxides with octahedral indium complexes was demonstrated. Direct chiral analysis of in situ-prepared phosphine oxides formed using phosphines and hydrogen peroxide was conducted effectively via 31P nuclear magnetic resonance spectroscopy. Sufficient peak resolution of chiral phosphines was obtained consistently, thereby enabling the reliable determination of absolute chirality. Rational 1:1 binding models based on experiments and density functional theory calculations have been proposed.
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Affiliation(s)
- Eun-Jeong Kwahk
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Sumin Jang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Hyunwoo Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
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9
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Zhang H, Zhao H, Wen J, Zhang Z, Stavropoulos P, Li Y, Ai L, Zhang J. Discrimination of enantiomers of amides with two stereogenic centers enabled by chiral bisthiourea derivatives using 1H NMR spectroscopy. Org Biomol Chem 2021; 19:6697-6706. [PMID: 34296731 PMCID: PMC9420356 DOI: 10.1039/d1ob00742d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Enantiomers of a few new amides containing two stereogenic centers have been derived from d- and l-α-amino acids as guests for chiral recognition by 1H NMR spectroscopy. A variety of chiral amides with two or more stereogenic centers often exist in the products of catalytic asymmetric synthesis, natural products or their total synthetic products, and chiral drugs. It would be a challenging and meaningful work to explore their chiral recognition. For this purpose, a class of novel chiral bisthiourea derivatives 1-9 has been synthesized from (1S,2S)-(+)-1,2-diaminocyclohexane, d-α-amino acids, and isothiocyanates as chiral solvating agents (CSAs). CSAs 1-9 proved to afford better chiral discriminating results towards most amides with two stereogenic centers, which have been rarely studied as chiral substrates by 1H NMR spectroscopy. In particular, CSAs 7, 8 and 9, featuring 3,5-bis(trifluoromethyl)benzene residues, exhibit outstanding chiral discriminating capabilities towards all amides, providing well-separated 1H NMR signals and sufficiently large nonequivalent chemical shifts. To test their practical application in the determination of enantiomeric excess, 1H NMR spectra of chiral amides (G16) with different optical purities were measured in the presence of CSAs 7 and 8, respectively. Their ee values (up to 90%) were accurately calculated by the integration of the NH proton of the CONHPh group of G16. To better understand the chiral discriminating behavior, Job plots of (±)-G16 with CSA 7 and (±)-G17 with CSA 8 and the association constants (Ka) of (S,R)-G16 and (R,S)-G16 with CSA 7 were evaluated, respectively. In order to further reveal any underlying intermolecular hydrogen bonding interactions, theoretical calculations of the enantiomers of (S,R)-G16 and (R,S)-G16 with CSA 7 were performed by means of the hybrid density functional theory (B3LYP) with the standard basis sets of 3-21G of the Gaussian 03 program, respectively.
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Affiliation(s)
- Hanchang Zhang
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Hongmei Zhao
- State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, P. R. China
| | - Jie Wen
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Zhanbin Zhang
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Pericles Stavropoulos
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
| | - Yanlin Li
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Lin Ai
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
| | - Jiaxin Zhang
- College of Chemistry, Beijing Normal University, Beijing 100875, P. R. China.
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10
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Jang S, Kim H. Understanding the Origin of the Chiral Recognition of Esters with Octahedral Chiral Cobalt Complexes. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100022] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Sumin Jang
- Department of Chemistry Korea Advanced Instituted of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Hyunwoo Kim
- Department of Chemistry Korea Advanced Instituted of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
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11
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Jang S, Kim H. Direct Chiral 19F NMR Analysis of Fluorine-Containing Analytes and Its Application to Simultaneous Chiral Analysis. Org Lett 2020; 22:7804-7808. [PMID: 32910666 DOI: 10.1021/acs.orglett.0c02620] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have demonstrated the efficient chiral analysis of fluorine-containing compounds by 19F NMR spectroscopy. The highly sensitive fluorine nucleus allowed chiral analysis of complex mixtures and even asymmetric reaction mixtures of multisubstrates. A single 19F NMR experiment was sufficient to determine the enantiomeric excesses and yields of the five products simultaneously.
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Affiliation(s)
- Sumin Jang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Hyunwoo Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
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12
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Li GW, Wang XJ, Cui DD, Zhang YF, Xu RY, Shi SH, Liu LT, Wang MC, Liu HM, Lei XX. Azaheterocyclic diphenylmethanol chiral solvating agents for the NMR chiral discrimination of alpha-substituted carboxylic acids. RSC Adv 2020; 10:34605-34611. [PMID: 35514411 PMCID: PMC9056771 DOI: 10.1039/d0ra06312f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Accepted: 08/24/2020] [Indexed: 12/02/2022] Open
Abstract
A series of small-membered heterocycle probes, so-called azaheterocycle-containing diphenylmethanol chiral solvating agents (CSAs), have been developed for NMR enantiodiscrimination. These chiral sensors were readily synthesized were inexpensive and efficiently used for the chiral analysis of alpha-substituted carboxylic acids. The sensing method was operationally simple and the processing was straightforward. Notably, we propose (S)-aziridinyl diphenylmethanol as a promising CSA, which has excellent chiral discriminating properties and offers multiple detectable possibilities pertaining to the 1H NMR signals of diagnostic split protons (including 25 examples, up to 0.194 ppm, 77.6 Hz). Its ability to detect the molecular recognition of fluorinated carboxylic acids were further investigated, with a good level of discrimination via the 19F NMR spectroscopic analysis. In addition, an accurate enantiomeric excess (ee) analysis of the p-methoxyl-mandelic acid with different optical compositions have been calculated based on the integration of well-separated proton signals.
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Affiliation(s)
- Gao-Wei Li
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
- School of Pharmaceutical Sciences, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Xiao-Juan Wang
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Dan-Dan Cui
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Yu-Fei Zhang
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Rong-Yao Xu
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Shuai-Hua Shi
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Lan-Tao Liu
- College of Chemistry and Chemical Engineering and Henan Engineering Laboratory of Green Synthesis for Pharmaceuticals, Shangqiu Normal University Shangqiu 476000 P. R. China
| | - Min-Can Wang
- School of Pharmaceutical Sciences, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Hong-Min Liu
- School of Pharmaceutical Sciences, Zhengzhou University Zhengzhou 450001 P. R. China
| | - Xin-Xiang Lei
- School of Pharmaceutical Sciences, South-Central University for Nationalities Wuhan 430074 P. R. China
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13
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Alimohammadi M, Hasaninejad A, Luu QH, Gladysz JA. Λ-[Co((S,S)-dpen)3]3+ 2I–B(C6F5)4–: A Second Generation Air- and Water-Stable Chiral Solvating Agent for Chirality Sensing (dpen = NH2CHPhCHPhNH2). J Org Chem 2020; 85:11250-11257. [DOI: 10.1021/acs.joc.0c01332] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Motahareh Alimohammadi
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - Alireza Hasaninejad
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - Quang H. Luu
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
| | - John A. Gladysz
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, Texas 77842-3012, United States
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14
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Jang S, Kim H. Chiral 1H NMR Analysis of Carbonyl Compounds Enabled by Cationic Cobalt Complex. Org Lett 2020; 22:4185-4189. [DOI: 10.1021/acs.orglett.0c01256] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Sumin Jang
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
| | - Hyunwoo Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
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