Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 엄익환 | - |
dc.date.accessioned | 2016-08-28T11:08:29Z | - |
dc.date.available | 2016-08-28T11:08:29Z | - |
dc.date.issued | 2003 | - |
dc.identifier.issn | 0253-2964 | - |
dc.identifier.other | OAK-1660 | - |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/219308 | - |
dc.description.abstract | Pseudo-first-order rate constants (kobs) have been measured spectrophotometrically for the reactions of 4-nitrophenyl benzoate with a series of pyridines in H2O containing 20 mol % DMSO. The plots of kobs vs pyridine concentration are linear up to ca. 0.1 M pyridines, indicating that the effect of self-association of pyridines with their conjugate acids are insignificant in this concentration range. The Brønsted-type plot has been obtained to be linear with a β nuc value 1.11, suggesting that the pyridinolyses proceed through a rate-determining breakdown of the zwiterionic addition intermediate. The pyridines studied have shown higher reactivity than isobasic primary and secondary amines toward the substrate. 1-Benzoyl-4-dimethylamino-pyridinium ion, a possible intermediate, has not been detected since the rate of its hydrolysis in the reaction condition is comparable with or even faster than its formation. | - |
dc.language | English | - |
dc.title | Effect of Amine Nature on Rates and Mechanism: Pyridinolyses of 4-Nitrophenyl Benzoate | - |
dc.type | Article | - |
dc.relation.issue | 9 | - |
dc.relation.volume | 24 | - |
dc.relation.index | SCI | - |
dc.relation.index | SCIE | - |
dc.relation.index | SCOPUS | - |
dc.relation.index | KCI | - |
dc.relation.startpage | 1245 | - |
dc.relation.lastpage | 1250 | - |
dc.relation.journaltitle | Bulletin of the Korean Chemical Society | - |
dc.identifier.wosid | WOS:000185710100004 | - |
dc.identifier.scopusid | 2-s2.0-0346964233 | - |
dc.author.google | Um I.-H. | - |
dc.author.google | Baek M.-H. | - |
dc.author.google | Han H.-J. | - |
dc.contributor.scopusid | 엄익환(7006725706;6506759437) | - |
dc.date.modifydate | 20230411105538 | - |