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dc.contributor.author엄익환-
dc.date.accessioned2016-08-28T12:08:56Z-
dc.date.available2016-08-28T12:08:56Z-
dc.date.issued2008-
dc.identifier.issn0253-2964-
dc.identifier.otherOAK-4758-
dc.identifier.urihttps://dspace.ewha.ac.kr/handle/2015.oak/219990-
dc.description.abstractThe apparent second-order rate constants (kN) have been dissected into the microscopic rate constants (i.e., k1 and k 2/k-1) associated with the reactions of Y-substituted phenyl cinnamates (5a-g) with piperidine and morpholine on the assumption that the reactions proceed through a stepwise mechanism with a change in the rate-determining step (RDS). The k1 value is larger for the reactions with the more basic piperidine, and increases with decreasing the basicity of the leaving aryloxides. However, the k2/k-1 ratio is almost the same for the reaction of 3,4-dinitrophenyl cinnamate (5a) with piperidine and for that with morpholine, which is not possible if the reactions proceed through a stepwise mechanism. Thus, the aminolysis of 5a-g has been proposed to proceed through a concerted mechanism. The activation parameters (ΔH‡ and ΔS‡) have been measured for the reactions of 3,4-dinitrophenyl benzoate (1a) and cinnamate (5a) with morpholine from the kinetic study performed at 5 different temperatures in 80 mol % H2O/20 mol % DMSO. The reaction of 5a results in a lager enthalpy of activation (ΔH‡) but a less negative entropy of activation (ΔS‡) than that of 1a.-
dc.languageEnglish-
dc.titleAminolysis of 3,4-dinitrophenyl cinnamate and benzoate 2: Activation parameters and transition-state structures-
dc.typeArticle-
dc.relation.issue3-
dc.relation.volume29-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.indexKCI-
dc.relation.startpage575-
dc.relation.lastpage579-
dc.relation.journaltitleBulletin of the Korean Chemical Society-
dc.identifier.wosidWOS:000255229900011-
dc.identifier.scopusid2-s2.0-41549151599-
dc.author.googleUm I.-H.-
dc.author.googlePark Y.-M.-
dc.contributor.scopusid엄익환(7006725706;6506759437)-
dc.date.modifydate20170601135413-
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자연과학대학 > 화학·나노과학전공 > Journal papers
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