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  1. Article ; Online: Synthesis of Tricyclic Tetrazoles by Cascade Diazotization/Intramolecular Radical C-H Heteroarylation of Arenes.

    Ha, Heun-Jong / Kim, Bora / Jo, Subin / Kim, Sugyeong / Park, Junho / Cho, Chang-Woo

    The Journal of organic chemistry

    2023  Volume 88, Issue 5, Page(s) 2714–2725

    Abstract: A cascade diazotization/intramolecular radical C-H heteroarylation of 1-benzyloxy-5-aminotetrazoles and 1-phenethyl-5-aminotetrazoles as substrates using sodium nitrite and acetic acid without any heating, catalysis, irradiation, or electrolysis is ... ...

    Abstract A cascade diazotization/intramolecular radical C-H heteroarylation of 1-benzyloxy-5-aminotetrazoles and 1-phenethyl-5-aminotetrazoles as substrates using sodium nitrite and acetic acid without any heating, catalysis, irradiation, or electrolysis is reported. This one-pot reaction afforded the desired tricyclic tetrazole products in good yields (up to 94%) without isolation of the diazonium salt intermediate under mild reaction conditions.
    Language English
    Publishing date 2023-02-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.2c02187
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  2. Article ; Online: Synthesis of

    Kim, Bora / Park, Junho / Cho, Chang-Woo

    Organic letters

    2021  Volume 23, Issue 12, Page(s) 4603–4607

    Abstract: A new and efficient cascade electrophilic trifluoromethylthiolation/radical rearrangement reaction of ketoximes is reported ... ...

    Abstract A new and efficient cascade electrophilic trifluoromethylthiolation/radical rearrangement reaction of ketoximes is reported using
    Language English
    Publishing date 2021-06-01
    Publishing country United States
    Document type Journal Article
    ISSN 1523-7052
    ISSN (online) 1523-7052
    DOI 10.1021/acs.orglett.1c01338
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Two-dimensional localization in GeSn.

    Gul, Y / Holmes, S N / Cho, Chang-Woo / Piot, B / Myronov, M / Pepper, M

    Journal of physics. Condensed matter : an Institute of Physics journal

    2022  Volume 34, Issue 48

    Abstract: Localization behaviour is a characteristic feature of ... ...

    Abstract Localization behaviour is a characteristic feature of the
    Language English
    Publishing date 2022-10-13
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/ac9814
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Synthesis of α-Trifluoromethylthio-α,β-Unsaturated Carbonyl Compounds by DABCO-Mediated Electrophilic Trifluoromethylthiolation with

    Yoo, Jeyeon / Ha, Heun-Jong / Kim, Bora / Cho, Chang-Woo

    The Journal of organic chemistry

    2020  Volume 85, Issue 11, Page(s) 7077–7085

    Abstract: A DABCO-mediated electrophilic α-trifluoromethylthiolation of α,β-unsaturated carbonyl compounds comprising no β-substituents has been achieved ... ...

    Abstract A DABCO-mediated electrophilic α-trifluoromethylthiolation of α,β-unsaturated carbonyl compounds comprising no β-substituents has been achieved using
    Language English
    Publishing date 2020-05-22
    Publishing country United States
    Document type Journal Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.0c00448
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  5. Article: Synthesis of α-Trifluoromethylthio-α,β-Unsaturated Carbonyl Compounds by DABCO-Mediated Electrophilic Trifluoromethylthiolation with N-SCF₃-Dibenzenesulfonimide

    Yoo, Jeyeon / Ha, Heun-Jong / Kim, Bora / Cho, Chang-Woo

    Journal of organic chemistry. 2020 May 13, v. 85, no. 11

    2020  

    Abstract: A DABCO-mediated electrophilic α-trifluoromethylthiolation of α,β-unsaturated carbonyl compounds comprising no β-substituents has been achieved using N-trifluoromethylthio-dibenzenesulfonimide as the SCF₃ source. The direct trifluoromethylthiolation ... ...

    Abstract A DABCO-mediated electrophilic α-trifluoromethylthiolation of α,β-unsaturated carbonyl compounds comprising no β-substituents has been achieved using N-trifluoromethylthio-dibenzenesulfonimide as the SCF₃ source. The direct trifluoromethylthiolation provides the corresponding α-trifluoromethylthio-α,β-unsaturated carbonyl products in good yields (up to 88%). Furthermore, the vinyl group in the α-trifluoromethylthio-α,β-unsaturated carbonyl product was successfully transformed into diverse functional groups in good to excellent yields (70–95%) by reactions such as epoxidation, aziridination, hydrocyanation, and hydrogenation.
    Keywords Lewis acids ; epoxidation reactions ; hydrogenation ; organic chemistry
    Language English
    Dates of publication 2020-0513
    Size p. 7077-7085.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.0c00448
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  6. Article ; Online: Enantioselective Phase-Transfer-Catalyzed Synthesis of Chiral N-Substituted 3,3-Dinitroazetidines by Aza-Michael Reaction.

    Lee, Hyo-Jun / Cho, Chang-Woo

    The Journal of organic chemistry

    2015  Volume 80, Issue 22, Page(s) 11435–11440

    Abstract: An efficient and highly enantioselective phase-transfer-catalyzed aza-Michael reaction of 3,3-dinitroazetidine, as N-centered nucleophile, to α,β-unsaturated ketones has been achieved using a quinidine-based phase-transfer catalyst (0.5-1 mol %), ... ...

    Abstract An efficient and highly enantioselective phase-transfer-catalyzed aza-Michael reaction of 3,3-dinitroazetidine, as N-centered nucleophile, to α,β-unsaturated ketones has been achieved using a quinidine-based phase-transfer catalyst (0.5-1 mol %), providing chiral N-substituted 3,3-dinitroazetidines in good yields (up to 99%) and excellent enantioselectivities (90-95% ee). This is the first example of the use of azetidines as N-centered nucleophiles in catalytic enantioselective aza-Michael reactions.
    Language English
    Publishing date 2015-11-20
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/acs.joc.5b02124
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Cinchona-based primary amine-catalyzed asymmetric cascade aza-Michael-aldol reactions of enones with 2-(1H-pyrrol-2-yl)-2-oxoacetates: synthesis of chiral pyrrolizines with multistereocenters.

    Lee, Hyo-Jun / Cho, Chang-Woo

    The Journal of organic chemistry

    2013  Volume 78, Issue 7, Page(s) 3306–3312

    Abstract: Cinchona-based primary amine-catalyzed cascade aza-Michael-aldol reactions of α,β-unsaturated ketones with 2-(1H-pyrrol-2-yl)-2-oxoacetates provided highly functionalized chiral pyrrolizines bearing multistereocenters including a chiral quaternary carbon ...

    Abstract Cinchona-based primary amine-catalyzed cascade aza-Michael-aldol reactions of α,β-unsaturated ketones with 2-(1H-pyrrol-2-yl)-2-oxoacetates provided highly functionalized chiral pyrrolizines bearing multistereocenters including a chiral quaternary carbon center in good yields (up to 92%) with excellent levels of stereocontrol (90-95% ee, >20:1 dr in all cases). The ketone group in the cascade product was asymmetrically reduced to chiral secondary hydroxyl groups in good yields.
    MeSH term(s) Amines/chemistry ; Catalysis ; Cinchona/chemistry ; Hydroxybenzoates/chemical synthesis ; Hydroxybenzoates/chemistry ; Ketones/chemistry ; Molecular Structure ; Pyrroles/chemical synthesis ; Pyrroles/chemistry ; Stereoisomerism
    Chemical Substances Amines ; Hydroxybenzoates ; Ketones ; Pyrroles
    Language English
    Publishing date 2013-04-05
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021/jo4001614
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  8. Article: Enantioselective Phase-Transfer-Catalyzed Synthesis of Chiral N-Substituted 3,3-Dinitroazetidines by Aza-Michael Reaction

    Lee, Hyo-Jun / Cho Chang-Woo

    Journal of organic chemistry. 2015 Nov. 20, v. 80, no. 22

    2015  

    Abstract: An efficient and highly enantioselective phase-transfer-catalyzed aza-Michael reaction of 3,3-dinitroazetidine, as N-centered nucleophile, to α,β-unsaturated ketones has been achieved using a quinidine-based phase-transfer catalyst (0.5–1 mol %), ... ...

    Abstract An efficient and highly enantioselective phase-transfer-catalyzed aza-Michael reaction of 3,3-dinitroazetidine, as N-centered nucleophile, to α,β-unsaturated ketones has been achieved using a quinidine-based phase-transfer catalyst (0.5–1 mol %), providing chiral N-substituted 3,3-dinitroazetidines in good yields (up to 99%) and excellent enantioselectivities (90–95% ee). This is the first example of the use of azetidines as N-centered nucleophiles in catalytic enantioselective aza-Michael reactions.
    Keywords catalysts ; chemical reactions ; chemical structure ; enantioselectivity ; ketones ; Lewis bases ; organic chemistry
    Language English
    Dates of publication 2015-1120
    Size p. 11435-11440.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 123490-0
    ISSN 1520-6904 ; 0022-3263
    ISSN (online) 1520-6904
    ISSN 0022-3263
    DOI 10.1021%2Facs.joc.5b02124
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  9. Article ; Online: Magneto-Optical Sensing of the Pressure Driven Magnetic Ground States in Bulk CrSBr.

    Pawbake, Amit / Pelini, Thomas / Mohelsky, Ivan / Jana, Dipankar / Breslavetz, Ivan / Cho, Chang-Woo / Orlita, Milan / Potemski, Marek / Measson, Marie-Aude / Wilson, Nathan P / Mosina, Kseniia / Soll, Aljoscha / Sofer, Zdenek / Piot, Benjamin A / Zhitomirsky, Mike E / Faugeras, Clement

    Nano letters

    2023  Volume 23, Issue 20, Page(s) 9587–9593

    Abstract: Competition between exchange interactions and magnetocrystalline anisotropy may bring new magnetic states that are of great current interest. An applied hydrostatic pressure can further be used to tune their balance. In this work, we investigate the ... ...

    Abstract Competition between exchange interactions and magnetocrystalline anisotropy may bring new magnetic states that are of great current interest. An applied hydrostatic pressure can further be used to tune their balance. In this work, we investigate the magnetization process of a biaxial antiferromagnet in an external magnetic field applied along the easy axis. We find that the single metamagnetic transition of the Ising type observed in this material under ambient pressure transforms under hydrostatic pressure into two transitions, a first-order spin-flop transition followed by a second-order transition toward a polarized ferromagnetic state near saturation. This reversible tuning into a new magnetic phase is obtained in layered bulk CrSBr at low temperature by varying the interlayer distance using high hydrostatic pressure, which efficiently acts on the interlayer magnetic exchange and is probed by magneto-optical spectroscopy.
    Language English
    Publishing date 2023-10-12
    Publishing country United States
    Document type Journal Article
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.3c03216
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Book ; Online: Factors Enabling Delocalized Charge-Carriers in Pnictogen-Based Solar Absorbers

    Fu, Yuchen / Lohan, Hugh / Righetto, Marcello / Huang, Yi-Teng / Kavanagh, Seán R. / Cho, Chang-Woo / Zelewski, Szymon J. / Woo, Young Won / Demetriou, Harry / McLachlan, Martyn A. / Heutz, Sandrine / Piot, Benjamin A. / Scanlon, David O. / Rao, Akshay / Herz, Laura M. / Walsh, Aron / Hoye, Robert L. Z.

    In-depth Investigation into CuSbSe2

    2024  

    Abstract: Inorganic semiconductors based on heavy pnictogen cations (Sb3+ and Bi3+) have gained significant attention as potential nontoxic and stable alternatives to lead-halide perovskites for solar cell applications. A limitation of these novel materials, which ...

    Abstract Inorganic semiconductors based on heavy pnictogen cations (Sb3+ and Bi3+) have gained significant attention as potential nontoxic and stable alternatives to lead-halide perovskites for solar cell applications. A limitation of these novel materials, which is being increasingly commonly found, is carrier localization, which substantially reduces mobilities and diffusion lengths. Herein, the layered p\v{r}\'ibramite CuSbSe2 is investigated and discovered to have delocalized free carriers, as shown through optical pump terahertz probe spectroscopy and temperature-dependent mobility measurements. Using a combination of theory and experiment, it is found that the underlying factors are: 1) weak coupling to acoustic phonons due to low deformation potentials, as lattice distortions are primarily accommodated through rigid inter-layer movement rather than straining inter-atomic bonds, and 2) weak coupling to optical phonons due to the ionic contributions to the dielectric constant being low compared to electronic contributions. This work provides important insights into how pnictogen-based semiconductors avoiding carrier localization could be identified.

    Comment: 47 pages, 4 figures
    Keywords Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2024-01-04
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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