作者:Sandy F. Lancelot、Frances L. Cozens、Norman P. Schepp
DOI:10.1039/b301959d
日期:——
phenethyl radicals bearing a range of electron donating and withdrawing aromatic substituents were generated and studied in a variety of solvent mixtures using nanosecond laser flash photolysis. Rate constants for the formation of the corresponding styrene radical cation via heterolytic loss of the beta-mesylate leaving group were measured using time-resolved absorption spectroscopy. The ionization reaction
产生了一系列带有一定范围的给电子和吸电子芳族取代基的β-甲磺酸苯乙基,并使用纳秒激光快速光解在各种溶剂混合物中进行了研究。使用时间分辨吸收光谱法测量通过β-甲磺酸酯离去基团的杂溶损失形成相应的苯乙烯自由基阳离子的速率常数。在各种溶剂和溶剂混合物(包括1,1,1,1,3,3,3-六氟-2-丙醇,2,2,2-三氟乙醇,乙腈,甲醇和水)中研究了电离反应。分别使用sigma + Hammett参数和Y(OMs)值讨论和评估了取代基电子效应和溶剂极性对β-杂解反应动力学的影响。