different substituents at the aryl ring. The obtained results support the competence of a concerted anionic intramolecular addition/elimination sequence and a radical dissociation/recombination sequence for explaining the tendency of migration for aryl groups. The more favored rearrangements are found for substrates with electron‐poor aryl groups that favor the anionic pathway.
A selected ion flow tube study of the reactions of small CmHn+ ions with O atoms
作者:Graham B. I. Scott、Daniel B. Milligan、David A. Fairley、Colin G. Freeman、Murray J. McEwan
DOI:10.1063/1.481050
日期:2000.3.15
The reactions of thirteen CmHn+ ions (m⩽6) with atomic and molecular oxygen and nitric oxide have been measured using a selectedionflowtube operating at room temperature. Rate coefficients and product distributions are reported for each reaction. Most of the hydrocarbon ions studied exhibit relatively rapid reactions with O atoms and proceed at substantial fractions of the collision rate. All O
使用在室温下运行的选定离子流管测量了 13 个 CmHn+ 离子 (m⩽6) 与原子和分子氧以及一氧化氮的反应。报告每个反应的速率系数和产物分布。所研究的大多数烃离子都表现出与 O 原子的相对快速反应,并且以碰撞速率的相当一部分进行。所有O原子反应都显示出多个产物通道和-C-O键的形成,无论是在离子产物中还是在反应的中性产物中。
Reactions of CH+ ions ith molecules at 300 K
作者:N.G. Adams、D. Smith
DOI:10.1016/0009-2614(78)85278-6
日期:1978.3
The rate coefficients and product ion distributions have been obtained for the reactions of the CH+n ions (n = 0 to 4) with COS, H2S, H2CO, CH3OH and CH3NH2 in a SIFT at 300K. The reactions are generally fast binary with multiple products except for CH+3 for which fast ternary association channels are also observed in parallel with the binary channels.
The rate constants for the reactions between CDitnH-itn+ and O have been measured and found to be fast, independent of isotope.The branching ratio for these reactions has been found to be statistical. Since decay of metastable triplet CD2HO+ shows a large isotope effect, it was thought that the present reactions might also do so. The fact that the present experiments do not show this large isotope
测量了CD itn H - itn +和O之间反应的速率常数,发现该速度常数快,与同位素无关,已发现这些反应的支化比是统计的。由于亚稳态三重态CD 2 HO +的衰变显示出较大的同位素效应,因此认为目前的反应也可以这样做。本实验未显示出如此大的同位素效应这一事实归因于反应CH 3 + + O←HCO + + H 2的放热性大,这打开了一些不涉及亚稳态三重态CD 2 HO +的替代途径。 作为中间体。
Oxidation of Alkyl Ions, C<i><sub>n</sub></i>H<sub>2</sub><i><sub>n</sub></i><sub>+1</sub><sup>+</sup> (<i>n</i> = 1−5), in Reactions with O<sub>2</sub> and O<sub>3</sub> in the Gas Phase
作者:Skip Williams、W. B. Knighton、Anthony J. Midey、A. A. Viggiano、Stephan Irle、Qingfang Wang、Keiji Morokuma
DOI:10.1021/jp031099+
日期:2004.3.1
product ion branching fractions are reported for the reactions of CH3+, C2H5+, s-C3H7+, s-C4H9+, t-C4H9+, and t-C5H11+ with O2 and O3 at 300 K in a variable-temperature selected-ion flow tube (VT-SIFT). The reaction rate constant for CH3+ with O3 is large and approximately equal to the thermal energy capture rate constant given by the Su−Chesnavich equation. The C2H5+, s-C3H7+, and s-C4H9+ ions are somewhat