Full metadata record
DC Field | Value | Language |
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dc.contributor.author | 엄익환 | - |
dc.date.accessioned | 2017-01-18T02:01:32Z | - |
dc.date.available | 2017-01-18T02:01:32Z | - |
dc.date.issued | 2007 | - |
dc.identifier.issn | 1477-0520 | - |
dc.identifier.other | OAK-4344 | - |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/233989 | - |
dc.description.abstract | Second-order rate constants have been measured for reactions of Y-substituted phenyl diphenylphosphinates (1a-h) with EtO -K + in anhydrous ethanol. A linear Brønsted-type plot is obtained with β Lg = -0.54, a typical β Lg value for reactions which proceed through a concerted mechanism. The Hammett plots correlated with σ o and σ - constants are linear but exhibit many scattered points, while the corresponding Yukawa-Tsuno plot results in excellent linear correlation with r = 0.41. The r value of 0.41 indicates that the leaving group departs at the rate-determining step (RDS) whether the reactions proceed through either a concerted or a stepwise mechanism. However, a stepwise mechanism in which departure of the leaving group occurs at the RDS is excluded since the incoming EtO - ion is much more basic and a poorer leaving group than the leaving aryloxide. The ΔH ‡ values determined in the current reactions are strongly dependent on the nature of the substituent Y, while the ΔS ‡ values remain constant on changing the substituent Y in the leaving group, i.e., from Y = H to Y = 4-NO 2 and Y = 3,4-(NO 2) 2. These ΔH ‡ and ΔS ‡ trends also support a concerted mechanism. © The Royal Society of Chemistry. | - |
dc.language | English | - |
dc.title | Combined dual substituent constant and activation parameter analysis assigns a concerted mechanism to alkaline ethanolysis at phosphorus of Y-substituted phenyl diphenylphosphinates | - |
dc.type | Article | - |
dc.relation.issue | 21 | - |
dc.relation.volume | 5 | - |
dc.relation.index | SCI | - |
dc.relation.index | SCIE | - |
dc.relation.index | SCOPUS | - |
dc.relation.startpage | 3539 | - |
dc.relation.lastpage | 3543 | - |
dc.relation.journaltitle | Organic and Biomolecular Chemistry | - |
dc.identifier.doi | 10.1039/b712427a | - |
dc.identifier.wosid | WOS:000250215700021 | - |
dc.identifier.scopusid | 2-s2.0-35348893220 | - |
dc.author.google | Um I.-H. | - |
dc.author.google | Park J.E. | - |
dc.author.google | Shin Y.-H. | - |
dc.contributor.scopusid | 엄익환(7006725706;6506759437) | - |
dc.date.modifydate | 20230411105538 | - |