Výsledky vyhledávání - "Dong-Sook Kwon"

Effect of Solvent on the α-Effect: Nucleophilic Substitution Reactions of p-Nitrophenyl Acetate with m-Chlorophenoxide and Benzohydroxamates in MeCN−H2O Mixtures of Varying Compositions

Autor: Dong-Sook Kwon, Ik-Hwan Um, Hye-Won Yoon, Jeoung-Sook Lee, Hyun-Jeung Moon

Publikováno v: The Journal of Organic Chemistry. 62:5939-5944

Second-order rate constants have been measured spectrophotometrically for the reactions of p-nitrophenyl acetate (PNPA) with three α-effect nucleophiles, benzohydroxamate (BHA-), p-methylbenzohydro...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::73e23695c58331c5a23954aaf98d15f2
https://doi.org/10.1021/jo970665s

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Acid dissociation constants of phenols and reaction mechanism for the reactions of substituted phenyl benzoates with phenoxide anions in absolute ethanol

Autor: Ik-Hwan Um, Yeon-Ju Hong, Dong-Sook Kwon

Publikováno v: Tetrahedron. 53:5073-5082

Acid dissociation constants of 10 substituted phenols have been measured by a kinetic method together with second-order rate constants for the reactions of aryl benzoates (X-C6H4CO-OC6H4-Y) with Z-substituted phenoxide (Z-C6H4O−) and EtO in absolut

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8a70b38d68b1d9a41cef4129c908c04b
https://doi.org/10.1016/s0040-4020(97)00227-5

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Thermal/oxidative degradation and stabilization of polyethylene glycol

Autor: Chongyoup Kim, Dong-Sook Kwon, Seongok Han

Publikováno v: Polymer. 38:317-323

Thermal degradation and stabilization of polyethylene glycol (PEG) with a molecular weight of 6000 have been investigated in order to develop PEG as a thermal energy storage material. Low molecular weight esters including formic esters were produced

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::748a6a999d9431be133113d4f270e336
https://doi.org/10.1016/s0032-3861(97)88175-x

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The effect of solvent on the α-effect: Abnormal nucleophilic reactivity of substituted acetophenone oximate anions in aqueous DMSO

Autor: Ik-Hwan Um, Su-Jin Oh, Dong-Sook Kwon

Publikováno v: Tetrahedron Letters. 36:6903-6906

The nucleophilic reactivity of substituted acetophenone oximate anions decreases with increasing base strengthening ability of the substituent, resulting in a positive Hammett ϱ value in H 2 O containing 20 mole % DMSO.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ec0975238cd1c77d3b4811a71618bc73
https://doi.org/10.1016/0040-4039(95)01426-i

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Transannular Diels-Alder reaction of a macrocyclic triene, (E,E,E)-13-trideca-2,8,10-trienolactone

Autor: Dong-Sook Kwon, Sun Ho Jung, Hokoon Park, Yeon Sun Lee

Publikováno v: Tetrahedron Letters. 36:1051-1054

( E , E , E )-13-trideca-2,8,10-trienolactone 3 undergoes rapid transannular Diels-Alder reaction to produce the trans-anti-cis tricyclic lactone 4 as a single cycloadduct.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b2cf8681f64f8f6453dfadaf7cc13914
https://doi.org/10.1016/0040-4039(94)02451-g

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Thermal degradation of poly(ethyleneglycol)

Autor: Seongok Han, Chongyoup Kim, Dong-Sook Kwon

Publikováno v: Polymer Degradation and Stability. 47:203-208

The thermal degradation of poly(ethyleneglycol) (PEG) with an average molecular weight of 4000 has been investigated from the point of view of developing PEG as a phase change material in thermal energy storage. The PEG was maintained at 80 °C for 1

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7f7c251897cb4c528e0e331e8f4d6d0b
https://doi.org/10.1016/0141-3910(94)00109-l

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ChemInform Abstract: Transannular Diels-Alder Reaction of a Macrocyclic Triene, (E,E,E)-13- Trideca-2,8,10-trienolactone

Autor: Dong-Sook Kwon, Sun Ho Jung, Hokoon Park, Yeon Sun Lee

Publikováno v: ChemInform. 26

( E , E , E )-13-trideca-2,8,10-trienolactone 3 undergoes rapid transannular Diels-Alder reaction to produce the trans-anti-cis tricyclic lactone 4 as a single cycloadduct.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::12549cd7a7be45609936d9aa8bb73243
https://doi.org/10.1002/chin.199524158

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