This paper describes the characterization of certain dioxolenium salts in which the heterocyclic ring is fused (via positions-4 and -5) to an anchored cyclohexane ring, and the steric course of their bimolecular cleavage with nucleophilic reagents. It was found that diaxial opening is normally favored strongly over diequatorial; this is accounted for in terms of differences in angle strain in the transition
本文描述了某些二
氧戊环盐的表征,其中杂环(通过位置 4 和 -5)与锚定的
环己烷环稠合,以及它们用亲核试剂进行双分子裂解的空间过程。发现双轴开放通常比双赤道更受青睐;这是根据过渡状态中角应变的差异来解释的。轴向(有角的)
甲基的存在使得双赤道开口优先;另一方面,对
环氧化物的双轴:双赤道开孔比的类似研究表明,反应的立体
化学实际上对有角度的
甲基不敏感。这些观察结果是根据
环氧化物和二
氧戊环离子的不同几何排列引起的不同非键合相互作用来解释的。双轴: 赤道开口比的变化在解释双轴 → 赤道...