Dimensiosolvatic Effects. III. Quantification of Dimensiosolvatic Effects by Solvolyses of 2-Bromoadamantane in Water–Alcohol Mixtures
作者:Michinori Oki、Hiroshi Ikeda、Shinji Toyota
DOI:10.1246/bcsj.71.749
日期:1998.3
Solvolyses of 2-bromoadamantane in aqueous alcohols were carried out to find the selectivities, kether/kalcohol, at various concentrations of water in an alcohol and at various temperatures. While the observed ratios contain a large error or fluctuate at low concentrations of water, they were almost constant for 1.0 : 0.8 alcohol/water mixtures. The selectivity was also independent of temperatures of the reaction. The significance of the selectivity, which is determined by the ease of solvent intervention into contact ion pairs, is discussed. D values, which are obtained by taking reciprocals of the selectivity for the 1.0 : 0.8 mixture, are proposed as a measure of the dimensiosolvatic effects when a solvent molecule intervenes into the contact ion pair.
在水性醇中进行2-溴金刚烷的溶剂分解,以发现在醇中不同浓度的水和不同温度下的选择性,酮/醇。虽然观察到的比率在低浓度水下存在较大误差或波动,但对于 1.0:0.8 的酒精/水混合物,它们几乎保持不变。选择性也与反应温度无关。讨论了选择性的重要性,选择性是由溶剂介入接触离子对的难易程度决定的。 D 值是通过取 1.0:0.8 混合物的选择性倒数获得的,建议作为溶剂分子介入接触离子对时维度溶剂化效应的量度。