Pulse radiolysis and election spin resonance studies of the dehydration of radicals from 1,2-diols and related compounds
作者:Steen Steenken、Michael J. Davies、Bruce C. Gilbert
DOI:10.1039/p29860001003
日期:——
The complementary techniques of pulse-radiolysis and e.s.r. spectroscopy have been employed in a kinetic study of the dehydration of a variety of α,β-dihydroxyalkyl radicals [˙CR1(OH)CR2R3OH] into the appropriate carbonyl-conjugated radicals [˙CR2R3C(O)R1]. The overall rates of proton-catalysed dehydration, as revealed by steady-state (e.s.r.) and time-resolved (pulse-radiolysis) experiments, indicate
脉冲辐解和ESR光谱的互补技术已经在各种α,β二羟基烷基的基团的[CR脱水的动力学研究已经采用1(OH)CR 2 - [R 3 OH]到相应的羰基共轭的基团[CR 2 - [R 3 C(O)R 1 ]。稳态(esr)和时间分辨(脉冲辐射分解)实验揭示的质子催化脱水的总速率表明了取代基的电子效应的重要性(对比度值为1.2×10 9和9.8×10 8 dm 3摩尔–1 s –1分别来自环己烷-1,2-二醇和丁烷-2,3-二醇的自由基,而赤藓糖醇的自由基分别为4.2×10 6 dm 3 mol –1 s –1)。时间分辨实验允许获得有关质子化物种[speciesCR 1(OH)CR 2 R 3 OH 2 + ]的生成以及该中间体中水分损失的信息。