期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2009, 期 36, 页码 6379-6385出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.200900925
关键词
Kinetics; Linear free energy relationships; Solvent effects; Nucleophilicity; Amines
资金
- Deutsche Forschungsgemeinschaft (DFG)
- Fonds der Chemischen Industrie
The kinetics of the reactions of primary and secondary amines with benzhydrylium ions and quinone methides in acetonitrile have been studied under pseudo-first-order conditions (high excess of amines) by UV/Vis spectrophotometry. Generally, the plots of k(obs) versus amine concentration were linear, in line with a second-order rate law. However, for some reactions of secondary amines with quinone methides, the plots of k(obs) versus amine concentration showed an upward curvature, which indicates rate-limiting deprotonation of the initially formed adduct by a second molecule of amine. From the second-order rate constants k(2) for the attack on the electrophiles by the amines, the nucleophilicity parameters N and s for the amines were determined from the linear free energy relationship log k(2) (20 degrees C) = s(N + E). The rates of the reactions of the amines with benzhydrylium ions are strongly affected by solvent polarity, in sharp contrast to the analogous reactions of other neutral nucleophiles. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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