Picosecond radical kinetics. Benzeneselenol as a fast radical trapping agent and rate constants for ring opening of the trans-(2-phenylcyclopropyl)carbinyl radical
Picosecond radical kinetics. Ring openings of phenyl-substituted cyclopropylcarbinyl radicals
作者:Martin Newcomb、Cathy C. Johnson、M. Beata Manek、Thomas R. Varick
DOI:10.1021/ja00053a031
日期:1992.12
Rate constants for ringopenings of the trans-(2-phenylcyclopropyl)carbinyl radical (1a), the cis-(2-phenylcyclopropyl)carbinyl radical (1b), and the (2,2-diphenylcyclopropyl)carbinyl radical (1c) were studied by competition kinetics using PTOC esters as radical precursors and hydrogen atom transfer trapping from benzeneselenol as the basis reaction. Radical 1a was studied in two solvents, toluene
研究了反式-(2-苯基环丙基)羰基(1a)、顺式-(2-苯基环丙基)羰基(1b)和(2,2-二苯基环丙基)羰基(1c)的开环速率常数通过使用 PTOC 酯作为自由基前体和从苯硒醇中捕获氢原子作为基础反应的竞争动力学。在甲苯和四氢呋喃这两种溶剂中研究了自由基 1a;1a 开环的实验 Arrhenius 函数为 log (κ r .s)=13.9-3.3/2.3RT (R in kcal/mol)
Picosecond Radical Kinetics. Fast Ring Openings of Secondary and Tertiary <i>trans</i>-2-Phenylcyclopropylcarbinyl Radicals