Výsledky vyhledávání - "Sam-Rok Keum"

Akademický článek

Surface Plasmon Spectroscopic Detection of Saxitoxin

Autor: Kwangnak Koh, Won Gun An, Jaebeom Lee, Heung-Jin Choi, Sung-Hoon Kim, Sam-Rok Keum, Youn Sook Kim, Hongxia Chen

Publikováno v: Sensors, Vol 7, Iss 7, Pp 1216-1223 (2007)

For the surface-optoelectronic study of Saxitoxin sensing, we fabricated self-assembled calix[4]arene derivative monolayers as the recognition-functional interfaces ona gold surface. An interaction study between Saxitoxin and calix[4]arene derivative

Externí odkaz: https://doaj.org/article/d6bd086d3c1f4e0baadbbb18336089ba

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Diastereomeric isomerization of Fischer's base analogs of LTAM molecules in organic solvents: mechanistic investigation

Autor: Sam-Rok Keum, So-Young Ma

Publikováno v: Tetrahedron. 70:1187-1192

Three possible mechanistic routes for the diastereomeric isomerization of the leuco-triarymethane (LTAM) molecules have been proposed, depending on the formal breaking of the carbon-carbon double bond via either heterolytic, homolytic or molecula spl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5260b6bc47dcb58be1b1deb1746c5710
https://doi.org/10.1016/j.tet.2013.12.080

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Akademický článek

Rearrangement mechanisms for azoxypyridines and azoxypyridine N-oxides in the 100% H2SO4 region — The Wallach rearrangement story comes full circle¹.

Autor: Buncel, Erwin¹ buncele@chem.queensu.ca, Sam-Rok Keum^1,2 keum@korea.ac.kr, Rajagopal, Srinivasan¹, Cox, Robin A. robin.a.cox@sympatico.ca

Publikováno v: Canadian Journal of Chemistry. Aug2009, Vol. 87 Issue 8, p1127-1134. 7p. 5 Diagrams, 1 Chart, 7 Graphs.

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Akademický článek

Wallach rearrangement of azoxypyridines and azoxypyridine N-oxides — Charge distributions and dramatic reactivity differences.

Autor: Buncel, Erwin¹ buncele@chem.queensu.ca, Sam-Rok Keum^1,2 keum@korea.ac.kr, Rajagopal, Srinivasan¹, Kiepek, Eric¹, Cox, Robin A.¹ robin.a.cox@sympatico.ca

Publikováno v: Canadian Journal of Chemistry. Apr2008, Vol. 86 Issue 4, p298-304. 7p. 6 Diagrams, 1 Chart, 2 Graphs.

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Synthesis and X-ray crystal structure of isomeric pyridine-based leuco-TAM dyes, 2,2-(2-(pyridinyl)propane-1,3-diylidene)bis(5-chloro-1,3,3-trimethyl indoline) derivatives and unusual stability of 4-pyridinyl compound

Autor: So-Young Ma, Sam-Rok Keum

Publikováno v: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 113:261-267

The solid-state structures and unequivocal stereochemistries of isomeric pyridine-based leuco-triarylmethane (LTAM) dyes 2,2'-(2-(pyridin-4 or 3-yl)propane-1,3-diylidene)bis(5-chloro-1,3,3-trimethylindoline) derivatives were established by X-ray crys

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::858605e2723fe4965fc487614f2715ed
https://doi.org/10.1016/j.saa.2013.04.079

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Unsymmetrically Substituted Leuco-Triarylmethane Molecules Formed from the Reaction of a Fischer's Base and α,β-Unsaturated Iminium Salts via a Michael-Type Reaction

Autor: Sam-Rok Keum, Do Kyung Kim, Hyun-Soo Kim

Publikováno v: Bulletin of the Korean Chemical Society. 34:1563-1566

E-mail: keum@korea.ac.krReceived January 14, 2013, Accepted February 22, 2013Key Words : Triarylmethane, Malachite green, Carbinol, Michael-type addition, α,β-unsaturated iminium saltsTriarylmethane (TAM) compounds, also known as “leuco-TAM” (L

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7bfe1e9d90a1112ef2273a4c3127fba6
https://doi.org/10.5012/bkcs.2013.34.5.1563

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Unsymmetric leuco-TAM dyes, (2E, 2′E)-2,2′-{(E)-4-phenylpent-2-ene-1,5-diylidene}bis(1,3,3-trimethylindoline) derivatives. Part II: X-ray crystal structure

Autor: Sam-Rok Keum, Hyun Woo Lim, Do-Kyung Kim, Se-Jung Roh, So-Young Ma

Publikováno v: Dyes and Pigments. 94:490-495

The unequivocal solid-state structure and stereochemistry of the unsymmetric leuco-triarylmethane (Un-LTAM) dye 2,2′-{(E)-4-(phenyl)pent-2-ene-1,5-diylidene}bis(1,3,3-trimethylindoline) derivatives were established using X-ray single-crystal analys

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::581aa950bbe7ee507480661aec7e758d
https://doi.org/10.1016/j.dyepig.2012.02.007

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Novel dimeric leuco-TAM dyes, 1,4-bis{(1E,3Z)-1,3-bis(1,3,3-trimethylindolin-2-ylidene)propan-2-yl}benzene derivatives: Structure and spectroscopic characterization

Autor: Do-Kyung Kim, Hyun-Woo Lim, Sam-Rok Keum, Se-Jung Roh, So-Young Ma

Publikováno v: Journal of Molecular Structure. 1014:126-133

Novel dimeric leuco-triarylmethane (LTAM) dyes, 1,4-bis{(1 E ,3 Z )-1,3-bis(1,3,3-trimethylindolin-2-ylidene)propan-2-yl}benzene derivatives, as precursors of dimeric TAM + and TAM ++ dyes, were synthesized and characterized by 1D and 2D NMR experime

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::82ce9fbde5f6138a98336ff6aa6724c9
https://doi.org/10.1016/j.molstruc.2012.02.002

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Unusual Stability of Diastereomers of the Isomeric Pyridine-based Leuco-TAM Dyes 2,2'-(2-(Pyridin-4 or 3-yl)propane-1,3-diylidene)bis(5-chloro-1,3,3-trimethylindoline)

Autor: Hyun Woo Lim, Do-Kyung Kim, Sam-Rok Keum, So-Young Ma, Se-Jung Roh

Publikováno v: Bulletin of the Korean Chemical Society. 33:681-684

E-mail: keum@korea.ac.krReceived October 26, 2011, Accepted November 23, 2011Key Words : Unusual stability, Diastereomers, Isomeric pyridine-based LTAM dyes, Malachite greenTriarylmethane (TAM) compounds, which are sometimescalled ‘leuco-TAMs’ (L

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b142d0d6b16dd2cf14cd0dabf85bbee9
https://doi.org/10.5012/bkcs.2012.33.2.681

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