Electrochemistry of Electron-Transfer Probes. The Role of the Leaving Group in the Cleavage of Radical Anions of α-Aryloxyacetophenones<sup>1</sup>
作者:Mogens L. Andersen、N. Mathivanan、Danial D. M. Wayner
DOI:10.1021/ja954093+
日期:1996.1.1
potential (E°) of α-phenoxyacetophenone has been determined from the voltammetric peak potential obtained by linear sweep voltammetry in combination with the rate constant for fragmentation of the radical anion which had been determined by laser flash photolysis. The E° values of a number of α-aryloxyacetophenones were then estimated from a correlation of the 13C chemical shifts of the carbonyl carbon
α-苯氧基苯乙酮的形式还原电位 (E°) 由线性扫描伏安法获得的伏安峰电位结合激光闪光光解测定的自由基阴离子碎裂速率常数确定。然后根据羰基碳的 13C 化学位移的相关性和一系列取代的 α-苯胺基苯乙酮内的类似相关性(E° 与 13C 化学位移)估计许多 α-芳氧基苯乙酮的 E° 值。使用这些电位(在很宽的取代基范围内仅变化 34 mV),α-芳氧基苯乙酮自由基阴离子碎裂的速率常数由相应伏安波的数字模拟确定。显示碎裂速率常数与相应酚的 pKa 相关。然而,动力学范围太小,实验误差太大,无法区分线性和二次频率...