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Your search keyword '"Yoon Je Seung"' showing total 6 results
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6 results on '"Yoon Je Seung"'

1. Elimination reactions of N-alkyl-N-chlorothenylamines promoted by MeONa-MeOH and Et2NH-MeCN: Effect of the beta-aryl group on the imine-forming transition state

Author

Sang Yong Pyun, Dong Choon Lee, Yoon Je Seung, and Bong Rae Cho

Subjects
Elimination reactions -- Research, Amines -- Chemical properties, Biological sciences, Chemistry
Abstract

Elimination reactions of N-alkyl-N-chlorothenylamines with MeONa-MeOH and Et2NH-MeCN are studied kinetically. The reactions are second order and exhibit substantial values of Hammett rho and k(sub H)/k(sub D), and an E2 mechanism is evident.

Published
2005

2. Ketene-forming eliminations from aryl phenylacetates promoted by R (sub)2 NH/R (sub)2 NH (sub)2 (super)+ in aqueous MeCN. Mechanistic borderline between E2 and E1cb

Author

Bong Rae Cho, Hyun Cheol Jeong, Yoon Je Seung, and Sang Yong Pyun

Subjects
Chemistry, Organic -- Research, Acetates -- Physiological aspects, Solution (Chemistry) -- Physiological aspects, Nitrogen -- Physiological aspects, Hydrogen -- Physiological aspects, Carbon -- Physiological aspects, Methylation -- Physiological aspects, Elimination reactions -- Research, Biological sciences, Chemistry
Abstract

Research has been conducted on the elimination reactions. Results indicate that these reactions proceed via the E2 mechanism and that this mechanism gradually changes from E2 to E1cb due to a systematic change of the reactant structure.

Published
2002

3. Elimination reactions of aryl phenylacetates promoted by R (sub)2 NH/R (sub)2 NH (sub)2 (super)+ in 70 mol % MeCN(aq). Effect of the beta-phenyl group on the ketene-forming transition state

Author

Bong Rae Cho, Yong Kwan Kim, Yoon Je Seung, Ju Chang Kim, and Sang Yong Pyun

Subjects
Chemistry, Organic -- Research, Hydrolysis -- Physiological aspects, Esters -- Physiological aspects, Solvents -- Physiological aspects, Biological sciences, Chemistry
Abstract

Research has been conducted on the ketene-forming transition state. The mechanistic diversity of the ketene-forming eliminations in the E2 and E1cb borderline has been investigated.

Published
2000

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