View : 289 Download: 0

Full metadata record

DC Field Value Language
dc.contributor.author엄익환-
dc.date.accessioned2016-08-28T10:08:32Z-
dc.date.available2016-08-28T10:08:32Z-
dc.date.issued2012-
dc.identifier.issn0253-2964-
dc.identifier.otherOAK-9043-
dc.identifier.urihttps://dspace.ewha.ac.kr/handle/2015.oak/222869-
dc.description.abstractPseudo-first-order rate constants kamine have been measured spectrophotometrically for the reactions of benzyl 4-pyridyl carbonate 6 with a series of alicyclic secondary amines in H 2O at 25.0°C. The plots of kamine vs. [amine] curve upward, indicating that the reactions proceed through a stepwise mechanism with two intermediates, a zwitterionic tetrahedral intermediate T ± and its deprotonated form T -. This contrasts to the report that the corresponding reactions of benzyl 2-pyridyl carbonate 5 proceed through a forced concerted pathway. The kamine values for the reactions of 6 have been dissected into the second-order rate constant Kk 2 and the thirdorder rate constant Kk 3. The Brønsted-type plots are linear with β nuc = 0.94 and 1.18 for Kk 2 and Kk 3, respectively. The Kk 2 for the reaction of 6 is smaller than the second-order rate constant kN for the corresponding reaction of 5, although 4-pyridyloxide in 6 is less basic and a better nucleofuge than 2-pyridyloxide in 5.-
dc.languageEnglish-
dc.titleKinetics and reaction mechanism for aminolysis of benzyl 4-pyridyl carbonate in h2o: Effect of modification of nucleofuge from 2-pyridyloxide to 4-pyridyloxide on reactivity and reaction mechanism-
dc.typeArticle-
dc.relation.issue7-
dc.relation.volume33-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.indexKCI-
dc.relation.startpage2269-
dc.relation.lastpage2273-
dc.relation.journaltitleBulletin of the Korean Chemical Society-
dc.identifier.doi10.5012/bkcs.2012.33.7.2269-
dc.identifier.wosidWOS:000306818100027-
dc.identifier.scopusid2-s2.0-84864255101-
dc.author.googleKang J.-S.-
dc.author.googleUm I.-H.-
dc.contributor.scopusid엄익환(7006725706;6506759437)-
dc.date.modifydate20170601135413-
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

BROWSE