Solution carbocation stabilities measured by internal competition for a hydride ion
作者:Nancy E. Okazawa、Ted S. Sorensen
DOI:10.1139/v82-311
日期:1982.9.1
studied (except cyclohexyl) stabilize a cation centre much better than an aliphatic equivalent, i.e. , in agreement with solvolysis rate studies. The same situation was found when comparing this aliphatic "system" against the 2-norbornyl cation (bicyclic) or against the tricyclic 2-adamantyl cation. In fact, in these cases the equil...
尽管已知许多技术可以比较溶液碳正离子的稳定性,但涉及氢阴离子分子间竞争的技术在概念上(但不是实验上)是最简单的程序。本文描述了一种在实验上更可靠的变体,它使用分子内平衡,其中两个竞争系统通过 -(CH2)n- 链保持在一起,例如通过系统地改变本例中的“n” (n = 0, 1 ,2, 或 3),已经发现两个或多个碳的亚甲基链是必要的,以最小化末端“系统”之间的空间相互作用。还发现所有研究的环烷基环(环己基除外)比脂族等效物更好地稳定阳离子中心,即,与溶剂分解速率研究一致。当将这种脂肪族“系统”与 2-降冰片基阳离子(双环)或三环 2-金刚烷基阳离子进行比较时,发现了相同的情况。事实上,在这些情况下,平衡...