Nucleophilicities of the Anions of Arylacetonitriles and Arylpropionitriles in Dimethyl Sulfoxide
作者:Oliver Kaumanns、Roland Appel、Tadeusz Lemek、Florian Seeliger、Herbert Mayr
DOI:10.1021/jo802241x
日期:2009.1.2
The rates of the reactions of the colored para-substituted phenylacetonitrile anions 1a−c and the phenylpropionitrile anions 2a−c with Michael acceptors (3a−u) were determined by UV−vis spectroscopy in DMSO at 20 °C. The reactions follow second-order kinetics, and the corresponding rate constants k2 obey the linear-free-energy relationship log k2(20 °C) = s(N + E), from which the nucleophile-specific
彩色对位取代的苯基乙腈阴离子1a - c和苯基丙腈阴离子2a - c与Michael受体(3a - u)的反应速率是通过DM中的UV-vis光谱在20°C下测定的。的反应遵循二级动力学,和对应的速率常数ķ 2服从自由线性能量关系日志ķ 2(20℃)=小号(Ñ + ë),从该特定亲核体参数Ñ和š的在碳负离子1A -c和2a - c已被推导。亲核性参数为19 < N <29,它们是迄今为止我们参数化的最具反应性的亲核体。在DMSO中,叔丁氧基阴离子的亲核性与对氰基苯基乙腈阴离子1b的亲核性相当。