1
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Wang P, Zhang J, Han L, Bi S, Liu T. Substituent-dependent generation of tricyclic frameworks by the rhodium-catalyzed cycloisomerization of homopropargyl allene-alkynes: a theoretical study. Dalton Trans 2020; 49:7406-7419. [DOI: 10.1039/d0dt00508h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Polycyclic compounds having biological activities can be modified by employing different substituents.
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Affiliation(s)
- Ping Wang
- Department of Chemistry and Chemical Engineering
- Jining University
- Qufu 273155
- China
- School of Chemistry and Chemical Engineering
| | - Jing Zhang
- Department of Chemistry and Chemical Engineering
- Jining University
- Qufu 273155
- China
- School of Chemistry and Chemical Engineering
| | - Lingli Han
- Department of Chemistry and Chemical Engineering
- Jining University
- Qufu 273155
- China
- School of Chemistry and Chemical Engineering
| | - Siwei Bi
- School of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- China
| | - Tao Liu
- Department of Chemistry and Chemical Engineering
- Jining University
- Qufu 273155
- China
- School of Chemistry and Chemical Engineering
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2
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Nguyen MH, Khuat TTH, Nguyen HH, Dinh TH. NiII
, PdII
Complexes with Pyrene-based Thiosemicarbazones: Syntheses, Molecular Structures, and Excimeric Emissions. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800437] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Minh-Hai Nguyen
- Department of Chemistry; Hanoi University of Science, Vietnam National University; 19 Le Thanh Tong Hanoi Vietnam
| | - Thi-Thuy-Ha Khuat
- Department of Chemistry; Hanoi University of Science, Vietnam National University; 19 Le Thanh Tong Hanoi Vietnam
| | - Hung-Huy Nguyen
- Department of Chemistry; Hanoi University of Science, Vietnam National University; 19 Le Thanh Tong Hanoi Vietnam
| | - Thi-Hien Dinh
- Department of Chemistry; Hanoi National University of Education; 136 Xuan Thuy Hanoi Vietnam
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3
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Pitts CR, Holl MG, Lectka T. Spectroscopic Characterization of a [C−F−C]
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Fluoronium Ion in Solution. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Cody Ross Pitts
- Department of Chemistry Johns Hopkins University 3400 North Charles St. Baltimore MD 21218 USA
- Department of Chemistry and Applied Biosciences ETH Zürich Vladimir-Prelog-Weg 2 8093 Zürich Switzerland
| | - Maxwell Gargiulo Holl
- Department of Chemistry Johns Hopkins University 3400 North Charles St. Baltimore MD 21218 USA
| | - Thomas Lectka
- Department of Chemistry Johns Hopkins University 3400 North Charles St. Baltimore MD 21218 USA
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4
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Pitts CR, Holl MG, Lectka T. Spectroscopic Characterization of a [C−F−C]
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Fluoronium Ion in Solution. Angew Chem Int Ed Engl 2018; 57:1924-1927. [DOI: 10.1002/anie.201712021] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 01/05/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Cody Ross Pitts
- Department of Chemistry Johns Hopkins University 3400 North Charles St. Baltimore MD 21218 USA
- Department of Chemistry and Applied Biosciences ETH Zürich Vladimir-Prelog-Weg 2 8093 Zürich Switzerland
| | - Maxwell Gargiulo Holl
- Department of Chemistry Johns Hopkins University 3400 North Charles St. Baltimore MD 21218 USA
| | - Thomas Lectka
- Department of Chemistry Johns Hopkins University 3400 North Charles St. Baltimore MD 21218 USA
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5
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Honda S, Adachi K, Yamamoto T, Tezuka Y. A Twisting Ring Polymer: Synthesis and Thermally Induced Chiroptical Responses of a Cyclic Poly(tetrahydrofuran) Having Axially Chiral Units. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Satoshi Honda
- Department
of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan
| | - Kaoru Adachi
- Department
of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki,
Sakyo-ku, Kyoto 606-8585, Japan
| | - Takuya Yamamoto
- Division
of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
| | - Yasuyuki Tezuka
- Department
of Organic and Polymeric Materials, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8552, Japan
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6
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Holl MG, Struble MD, Singal P, Siegler MA, Lectka T. Positioning a Carbon–Fluorine Bond over the π Cloud of an Aromatic Ring: A Different Type of Arene Activation. Angew Chem Int Ed Engl 2016; 55:8266-9. [DOI: 10.1002/anie.201601989] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 03/14/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Maxwell Gargiulo Holl
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
| | - Mark D. Struble
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
| | - Prakhar Singal
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
| | - Maxime A. Siegler
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
| | - Thomas Lectka
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
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7
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Holl MG, Struble MD, Singal P, Siegler MA, Lectka T. Positioning a Carbon–Fluorine Bond over the π Cloud of an Aromatic Ring: A Different Type of Arene Activation. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601989] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Maxwell Gargiulo Holl
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
| | - Mark D. Struble
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
| | - Prakhar Singal
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
| | - Maxime A. Siegler
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
| | - Thomas Lectka
- Department of Chemistry Johns Hopkins University 3400 North Charles Street Baltimore MD 21218 USA
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8
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Rastogi SK, Rogers RA, Shi J, Brown CT, Salinas C, Martin KM, Armitage J, Dorsey C, Chun G, Rinaldi P, Brittain WJ. Through-space (19)F-(19)F spin-spin coupling in ortho-fluoro Z-azobenzene. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:126-131. [PMID: 26332615 DOI: 10.1002/mrc.4327] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 07/22/2015] [Accepted: 07/30/2015] [Indexed: 06/05/2023]
Abstract
We report through-space (TS) (19)F-(19)F coupling for ortho-fluoro-substituted Z-azobenzenes. The magnitude of the TS-coupling constant ((TS) JFF ) ranged from 2.2-5.9 Hz. Using empirical formulas reported in the literature, these coupling constants correspond to non-bonded F-F distances (dFF) of 3.0-3.5 Å. These non-bonded distances are significantly smaller than those determined by X-ray crystallography or density functional theory, which argues that simple models of (19)F-(19)F TS spin-spin coupling solely based dFF are not applicable. (1)H, (13)C and (19)F data are reported for both the E and Z isomers of ten fluorinated azobenzenes. Density functional theory [B3YLP/6-311++G(d,p)] was used to calculate (19) F chemical shifts, and the calculated values deviated 0.3-10.0 ppm compared with experimental values.
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Affiliation(s)
- Shiva K Rastogi
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Robert A Rogers
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Justin Shi
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Christopher T Brown
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Cindy Salinas
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Katherine M Martin
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Jacob Armitage
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Christopher Dorsey
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
| | - Gao Chun
- Department of Chemistry, The University of Akron, Akron, OH, 44325, United States
| | - Peter Rinaldi
- Department of Chemistry, The University of Akron, Akron, OH, 44325, United States
| | - William J Brittain
- Department of Chemistry and Biochemistry, Texas State University, 601 University Drive, San Marcos, TX, 78666, United States
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9
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Rastogi SK, Rogers RA, Shi J, Gao C, Rinaldi PL, Brittain WJ. Conformational Dynamics of o-Fluoro-Substituted Z-Azobenzene. J Org Chem 2015; 80:11485-90. [PMID: 26505924 DOI: 10.1021/acs.joc.5b02202] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A conformational analysis of o-fluoro Z-azobenzene reveals a slight preference for aromatic C-F/π interaction. Density functional theory (DFT) indicates that the conformation with a C-F/π interaction is preferred by approximately 0.3-0.5 kcal/mol. Ground-state conformations were corroborated with X-ray crystallography. (Z)-Azobenzene (Z-AB) with at least one o-fluoro per ring displays (19)F-(19)F through-space (TS) coupling. 2D J-resolved NMR was used to distinguish through-bond from TS coupling ((TS)JFF). (TS)JFF decreases as the temperature is lowered and the multiplets coalesce into broad singlets. We hypothesize that the coalescence temperature (Tc) corresponds to the barrier for phenyl rotation. The experimentally determined barrier of 8-10 kcal/mol has been qualitatively verified by DFT where transition states with a bisected geometry were identified with zero-point energies of 6-9 kcal/mol relative to ground state. These values are significantly higher that values estimated from previous theoretical studies but lie within a reasonable range for phenyl rotation in hydrocarbon systems.
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Affiliation(s)
- S K Rastogi
- Department of Chemistry and Biochemistry, Texas State University , San Marcos, Texas 78666, United States
| | - R A Rogers
- Department of Chemistry and Biochemistry, Texas State University , San Marcos, Texas 78666, United States
| | - J Shi
- Department of Chemistry and Biochemistry, Texas State University , San Marcos, Texas 78666, United States
| | - C Gao
- Department of Chemistry, The University of Akron , Akron, Ohio 44325, United States
| | - P L Rinaldi
- Department of Chemistry, The University of Akron , Akron, Ohio 44325, United States
| | - W J Brittain
- Department of Chemistry and Biochemistry, Texas State University , San Marcos, Texas 78666, United States
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10
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Chang YY, Ho TL, Chung WS. Deformative transition of the Menschutkin reaction and helical atropisomers in a congested polyheterocyclic system. J Org Chem 2014; 79:9970-8. [PMID: 25279831 DOI: 10.1021/jo501815y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A 4,7-phenanthroline polycyclic 1A designed for probing the limits of the Menschutkin reaction was synthesized in a six-step sequence. The rotational barrier of the phenyl ring nearby the N-methyl group in rac-2A was estimated to be ≫ 18.1 kcal/mol from VT-NMR experiments, making them a new type of helical atropisomer. The methylation rate constants of 9 and 1A with MeI was found to be 2.22 × 10(-4) and 9.62 × 10(-6) s(-1) mol(-1) L, respectively; thus, the formation rate of (P/M)-2A is one of the slowest rates ever reported for a Menschutkin reaction. The N-methyl protons in (P/M)-2A exhibit a significant upfield shift (Δδ 1.0 ppm) in its (1)H NMR, compared to those without a nearby phenyl, indicating a strong CH-π interaction is involved. Conformational flexibility in dipyridylethene 9 is clearly shown by its complexation with BH3 to form helical atropisomers (P,P/M,M)-10. The pKa values of the conjugate acids of 1A and 9 in acetonitrile were determined to be 4.65 and 5.07, respectively, which are much smaller compared to that of pyridine 14a (pKa = 12.33), implying that the basicity, nucleophilicity, and amine alkylation rates of 1A and 9 are markedly decreased by the severe steric hindrance of the flanking phenyl rings in the polyheterocycles.
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Affiliation(s)
- Yung-Yu Chang
- Department of Applied Chemistry, National Chiao-Tung University , Hsinchu 30050, Taiwan-ROC
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