Direct Observation of the Gas Phase Reaction of the Cyclohexyl Radical with Dioxygen Using a Distonic Radical Ion Approach
作者:Benjamin B. Kirk、David. G. Harman、Stephen J. Blanksby
DOI:10.1021/jp9073398
日期:2010.1.28
suggest that the structures of the reaction products correspond to cyclohexenes and epoxides from HO2• and HO• loss, respectively, while alternative pathways leading to cyclohexanone or ring-opened isomers are not observed. Activation of the charged peroxyl radical •OO−C6H10−CO2− by collision induced dissociation also results in the loss of HO2• and HO• radicals confirming that these products are directly
烷基过氧自由基是烃氧化的中间体。但是,这些中间体的反应性使其难以直接观察和分离。我们已采用离子阱质谱合成和表征4- carboxylatocyclohexyl自由基阴离子(• ç 6 ħ 10 -CO 2 - )在分子氧的存在,并观察它们的反应性。所得反应很容易(k = 1.8×10 -10 cm 3分子-1 s -1或计算的碰撞率的30%),并导致(i)添加O 2为了形成稳定的4- carboxylatocyclohexylperoxyl自由基阴离子(• OO-C 6 H ^ 10 -CO 2 - ),提供一个基团的cyclohexylperoxyl第一直接观察,和(ii)消除HO的2 •和HO •自由基与最近激光一致诱导的荧光研究中性环己基与O 2的反应。在B3LYP / 6-31 + G(d)理论水平上的电子结构计算揭示了观察到的反应的可行途径,表明过氧自由基的形成被37 kcal mol