CH 3 C(O)O 2本身与CH 3 O 2的反应是使用快速光解结合时间分辨紫外光谱和瞬态红外吸收进行研究的。CH 3 C(O)O 2的紫外光谱显示出两个谱带。较强的短波分量在206 nm处的最大横截面为6.5×10 -18 cm 2,而较弱的短波长分量在250 nm处的最大横截面为2.9×10 -18 cm 2。这些频带被用于监测CH消失3 C(O)O 2和次级CH的形成3 ö 2,产生的自反应速率常数为 ×10 -12 e (504±114)/ T cm 3 s -1和交叉反应速率常数为 ×10 -13 e (726±75)/ T cm 3 s -1。对CH 2 O形成的瞬态红外监测显示CH 3 C(O)O 2 + CH 3 O 2 →CH 2 O + CH 3 COOH + O 2是整个209-358 K温度范围内交叉反应的主要通道。这与先前的研究相反,后者的研究表明支化比率对温度的依赖性很强,在高温下通道导致CH
Flash photolysis study of the UV spectrum and kinetics of reactions of the acetonylperoxy radical
作者:Isabelle Bridier、Bernard Veyret、Robert Lesclaux、Michael E. Jenkin
DOI:10.1039/ft9938902993
日期:——
2CH3C(O)CH2O2→ 2CH3C(O)CH2O + O2(7a) and → CH3C(O)CH2OH + CH3C(O)CHO + O2(7b) with k7=(8.0 ± 2.0)× 10–12 cm3 molecule–1 s–1 and k7a/k7=(0.75 ± 0.1). The kinetics of the reactions between CH3C(O)CH2O2 and the CH3C(O)O2, CH3O2 and HO2radicals were determined by adding acetaldehyde, methane or methanol to the photolysis mixtures: CH3C(O)CH2O2+ CH3C(O)O2→ O2+ CH3C(O)CH2O + CH3+ CO2(11a); → O2+ CH3C(O)OH + CH3C(O)CHO
通过快速光解-紫外吸收法研究了在氧存在下通过Cl原子与丙酮之间的反应形成的CH 3 C(O)CH 2 O 2自由基的紫外光谱和动力学。根据描述使用最终产品分析的工作的前一篇文章的结果对结果进行了分析。过氧自由基CH 3 C(O)CH 2 O 2在UV中吸收,在约230和290 nm处有两个最大值。该过氧自由基根据以下条件反应:2CH 3 C(O)CH 2 O 2 →2CH 3 C(O)CH 2 O + O 2(7 a)和→CH 3 C(O)CH 2 OH + CH 3 C(O)CHO + O 2(7 b),其中k 7 =(8.0±2.0)×10 –12 cm 3分子–1 s –1和k 7 a / k 7=(0.75±0.1)。CH 3 C(O)CH 2 O 2与CH 3 C(O)O 2,CH 3 O 2和HO 2之间反应的动力学通过向光解混合物中添加乙醛,甲烷或甲醇来确定自由基:CH 3 C(O)CH
Kinetics of the reaction of HO2 with CH3C(O)O2 in the temperature range 253–368 K
作者:Geert K. Moortgat、Bernard Veyret、Robert Lesclaux
DOI:10.1016/0009-2614(89)87624-9
日期:1989.8
The kinetics of the reaction between the HO2 and CH3C(O)O2 radicals has been studied in the gas phase at atmospheric pressure between 253 and 368 K. Flash photolysis was used to produce the radicals which were detected by their absorption in the UV. The two reactive channels for this reaction are CH3C(O)O2+HO2→CH3C(O)OOH+O2 (1a) and→CH3C(O)OH+O3 (1b). The overall rate constant measurement gave a value
在大气压力下,在253和368 K之间的气相中研究了HO 2和CH 3 C(O)O 2自由基之间反应的动力学。通过快速光解法制备了自由基,并通过吸收这些自由基来检测自由基。紫外线。用于该反应的两个反应性通道是CH 3 C(O)O 2 + HO 2 →CH 3 C(O)OOH + O 2(1a)和→CH 3 C(O)OH + O 3(1b)。总速率常数测量结果为k 1 =(4.3±1.2)×10 -13 exp [(1040±100)/ T ] cm 3分子-1 s -1 ; 发现支化比k 1b /(k 1a + k 1b)与温度无关,等于0.33±0.07。
The rapid hydration of the acetyl radical. A pulse radiolysis study of acetaldehyde in aqueous solution.
作者:Man Nien. Schuchmann、Clemens. Von Sonntag
DOI:10.1021/ja00225a019
日期:1988.8
are in a 0.8:1 equilibrium. Hydroxyl radicals generated by the pulse radiolysis of N/sub 2/O-saturated water react with this mixture with an overall rate constant of k = 2.4 x 10/sup 9/ dm/sup3/ mol/sup -1/ s/sup -1/, the rate of reaction with acetaldehyde being about 3 times faster than with the hydrate. The predominant radicals formed are the acetyl radical and its hydrated form, H-abstraction at
Reactions of Superoxo and Oxo Metal Complexes with Aldehydes. Radical-Specific Pathways for Cross-Disproportionation of Superoxometal Ions and Acylperoxyl Radicals
作者:Andreja Bakac
DOI:10.1021/ja026365w
日期:2002.8.1
remote oxygen of Cr(aq)OO(2+), followed by elimination of O(2) and formation of CH(3)COOH and Cr(V)(aq)O(3+). The latter disproportionates and ultimately yields Cr(aq)(3+) and HCrO(4)(-). No CO(2) was detected. The Cr(aq)OO(2+)/C(CH(3))(3)C(O)OO(*) reaction yielded isobutene, CO(2), and Cr(aq)(3+), in addition to chromate. In the suggested mechanism, the transient Cr(aq)OOOO(O)CC(CH(3))(3)(2+) branches into
Reactions of oxygenated radicals in the gas phase. Part II. Reactions of peracetyl radicals and butenes
作者:Keith Selby、David J. Waddington
DOI:10.1039/p29750001715
日期:——
410.1 K, peracetic acid and peracetyl radicals (formed from acetaldehyde) react with the hydrocarbon to form the corresponding epoxide [reactions (1) and (2)]. [graphic omitted] [graphic omitted]. The relative proportion of the epoxidising agents changes with time, reaction (2) being predominant in the early stages of reaction. Arrhenius parameters for the reactions of but-1-ene and 2-methylpropene are