Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 엄익환 | - |
dc.date.accessioned | 2016-08-28T10:08:32Z | - |
dc.date.available | 2016-08-28T10:08:32Z | - |
dc.date.issued | 2012 | - |
dc.identifier.issn | 0253-2964 | - |
dc.identifier.other | OAK-9043 | - |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/222869 | - |
dc.description.abstract | Pseudo-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.language | English | - |
dc.title | Kinetics 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.type | Article | - |
dc.relation.issue | 7 | - |
dc.relation.volume | 33 | - |
dc.relation.index | SCI | - |
dc.relation.index | SCIE | - |
dc.relation.index | SCOPUS | - |
dc.relation.index | KCI | - |
dc.relation.startpage | 2269 | - |
dc.relation.lastpage | 2273 | - |
dc.relation.journaltitle | Bulletin of the Korean Chemical Society | - |
dc.identifier.doi | 10.5012/bkcs.2012.33.7.2269 | - |
dc.identifier.wosid | WOS:000306818100027 | - |
dc.identifier.scopusid | 2-s2.0-84864255101 | - |
dc.author.google | Kang J.-S. | - |
dc.author.google | Um I.-H. | - |
dc.contributor.scopusid | 엄익환(7006725706;6506759437) | - |
dc.date.modifydate | 20230411105538 | - |