Unusual Reaction Constant for Hydride Transfer from a Carbanion to 9-Arylxanthyliums
作者:Fengrui Liu、Xiaoqing Zhu
DOI:10.1002/ejoc.201403023
日期:2014.11
The reaction constant (ρ) from the kinetics for hydride transfer from a carbanion (XH–) to 9-arylxanthylium ions (9-GPhXn+) in CH3CN was unusually negative. Thermodynamic analysis indicated that ρ for the simple hydride transfers (only involved with release and capture of a hydride anion) should be positive; this is in contrast to the kinetics results. Consequently, this reaction is not a simple hydride
从氢化物在 CH3CN 中从碳负离子 (XH–) 转移到 9-芳基黄嘌呤离子 (9-GPhXn+) 的动力学中,反应常数 (ρ) 异常地为负值。热力学分析表明,简单氢化物转移(仅涉及氢化物阴离子的释放和捕获)的 ρ 应为正值;这与动力学结果相反。因此,该反应不是简单的氢化物转移。在反应体系中还发现了一种“中间体”,它的形成导致了不寻常的 ρ。