Inductive, Hyperconjugative and Frangomeric Effects in the Solvolysis of 1-Substituted 3-Bromoadamantanes. Polar effects IV
作者:Walter Fischer、Cyril A. Grob
DOI:10.1002/hlca.19780610510
日期:1978.7.12
Three kinds of polar substitutent effects are observable in the solvolyses of 1-R-substituted 3-bromoadamantanes (VI). This follows from the relationship between products, rate constants k in 80% ethanol, and the inductive substituent constants σ of the substituent R. Alkyl groups and electron-attracting substituents at C (1) control the rate by their inductive effects alone, since logk correlates closely
1-R-取代的3-溴金刚烷(VI)的溶剂分解中可观察到三种极性取代基作用。这取决于产物,在80%的乙醇中的速率常数k和取代基R的感应取代基常数σ之间的关系。C(1)上的烷基和吸引电子的取代基仅通过它们的感应作用控制速率,因为log k与σ紧密相关。但是,共轭时(+ M)取代基或电离基团连接到C(1)。这些崇高的取代基作用归因于从C(3)的阳离子中心到C(1)的取代基的正电荷CC超共轭中继。当取代基是强电子供体(例如ø -和S - ),加速取代让位给然后由frangomeric效果控制异裂分裂,费率和产品。