Výsledky vyhledávání - "Sang-Yong Pyun"

Akademický článek

Acyl Transfer Reactions of 2,4-Dinitrophenyl Furoates: Comparative Effects of Nucleophiles and Non-Leaving Groups

Publikováno v: Chemistry, Vol 6, Iss 5, Pp 1301-1311 (2024)

This study investigated the acyl group transfer reactions of 2,4-dinitrophenyl 5-substituted-2-furoates, promoted by 4-substituted phenoxides/phenols in a 20 mol% DMSO aqueous solution at 25 °C. The reactions yielded nucleophilic substitution produc

Externí odkaz: https://doaj.org/article/f38957ad3ff04112bebece08a1203fbc

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Reactions of 4‐Nitrophenyl 5‐substituted Furan‐2‐carboxylates with R 2 NH / R 2 NH 2 + in 20 mol% DMSO (aq): Effect of Aryl Group on the Acyl‐Transfer Reaction

Autor: Sang Yong Pyun, Man So Han, Kyu Cheol Paik, Bong Rae Cho

Publikováno v: Bulletin of the Korean Chemical Society. 42:994-1000

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e11ff57b53f5ecb3d9a58293b4a6bd95
https://doi.org/10.1002/bkcs.12296

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Akademický článek

Base-promoted elimination reactions of (E)- and (Z)-arylaldehyde O-benzoyloximes. Effects of stereochemistry, β-aryl group and base-solvent on the nitrile-forming transition states

Autor: Sang Yong Pyun, Bong Rae Cho

Publikováno v: ARKIVOC, Vol 2010, Iss 7, Pp 118-137 (2010)

Externí odkaz: https://doaj.org/article/f8709f3a52ba48ed9aabcdbec1233c96

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Reactions of 2,4‐Dinitrophenyl 5‐substituted‐2‐thiophenecarboxylates with R 2 NH/R 2 NH 2 + in 20 Mol % DMSO(aq). Effects of 5‐Thienyl Substituent and Leaving Group on the Reaction Mechanism

Autor: Kyu Cheol Paik, Sang Yong Pyun, Man So Han, Bong Rae Cho

Publikováno v: Bulletin of the Korean Chemical Society. 40:983-990

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::566fe41b86ba95995a63a7fccf44bc60
https://doi.org/10.1002/bkcs.11857

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Elimination Reactions of Aryl Furylacetates Promoted by R2 NH in MeCN: Effects of Base Solvent and β-Aryl Group on the Ketene-forming Transition State

Autor: Sang Yong Pyun, Bong Rae Cho, Byung Tae Kim, Man So Han, Kyu Cheol Paik

Publikováno v: Bulletin of the Korean Chemical Society. 38:1306-1309

Ketene-forming elimination from C4H3(O)CH2C(O)OC6H3-2-X-4-NO2 (1) promoted by R2NH in MeCN has been studied. The reactions produced elimination products and exhibited second-order kinetics with Bronsted β = 0.51, and |βlg| = 0.47–0.53, indicating

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::df7637b96db2fe460913f50fdde24ec9
https://doi.org/10.1002/bkcs.11285

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Elimination Reactions of (E)-2,4,6-TrinitrobenzaldehydeO-Benzoyloximes Promoted by R2NH/R2NH2+in 70 mol% MeCN (aq). Effects of the β-Aryl Group and Leaving Group on Nitrile-Forming Transition States

Autor: Sang Yong Pyun, Man So Han, Kyu Cheol Paik, Bong Rae Cho

Publikováno v: Bulletin of the Korean Chemical Society. 37:871-876

Elimination reactions of (E)-2,4,6-(NO2 ) 3C6H2CHNOC(O)C6H4X (3) promoted by R2NH/R2NH2 + in 70 mol% MeCN (aq) have been studied. The reactions produced elimination products and exhibited second-order kinetics. The β and |βlg| values remained nearl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::212511c6b44630d35f3367b1a8f946e7
https://doi.org/10.1002/bkcs.10791

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Akademický článek

Reactions of Aryl 5-substituted-2-Thiophenecarboxylates Promoted by 4-Z-C6H4O^-/4-Z-C6H4OH in 20 mol % DMSO(aq). Effect of Nucleophile on Acyl-Transfer Reaction.

Autor: Sang Yong Pyun¹ sypyun@pknu.ac.kr, Kyu Cheol Paik², Man So Han², Bong Rae Cho³

Publikováno v: Bulletin of the Korean Chemical Society. Dec2015, Vol. 36 Issue 12, p2810-2814. 5p.

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Reactions of Aryl 5-substituted-2-Thiophenecarboxylates Promoted by 4-Z-C6H4O−/4-Z-C6H4OH in 20 mol % DMSO(aq). Effect of Nucleophile on Acyl-Transfer Reaction

Autor: Kyu Cheol Paik, Man So Han, Sang Yong Pyun, Bong Rae Cho

Publikováno v: Bulletin of the Korean Chemical Society. 36:2810-2814

Nucleophilic substitution reactions of 5-XC4H2 (S)C(O)OC6H3 -2-Y-4-NO2 (1) promoted by 4-Z-C6H4O −/4-Z-C6H4OH in 20 mol % dimethyl sulfoxide (DMSO)(aq) have been studied kinetically. The reactions exhibited second-order kinetics with βacyl = −2.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1d87c92c542ae4cf20c8fe3ee242ab10
https://doi.org/10.1002/bkcs.10567

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Akademický článek

Elimination Reactions of Aryl Furylacetates Promoted by R2NH-R2NH2⁺ in 70 mol% MeCN(aq). Effects of β--Aryl on the Ketene-Forming Transition-State.

Autor: Sang Yong Pyun¹ sypyun@pknu.ac.kr, Ju Chang Kim¹, Bong Rae Cho² chobr@korea.ac.kr

Publikováno v: Bulletin of the Korean Chemical Society. 2014, Vol. 35 Issue 7, p2143-2147. 5p.

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Elimination Reactions of Aryl Furylacetates Promoted by R2NH-R2NH2+in 70 mol% MeCN(aq). Effects of β-Aryl on the Ketene-Forming Transition-State

Autor: Bong Rae Cho, Ju Chang Kim, Sang Yong Pyun

Publikováno v: Bulletin of the Korean Chemical Society. 35:2143-2147

the effect of the β-aryl group on the ketene-formingelimination was assessed.Key Words : Elimination, E2 and E1cb Mechanism, β–Aryl Group effectIntroductionExtensive studies of the structure-reactivity relationshipsin the ketene-forming eliminati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a65ab91e01dc7fb8ef976d5d1d30d707
https://doi.org/10.5012/bkcs.2014.35.7.2143

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