A Spectroscopic, Kinetic, and Product Study of the (CH<sub>3</sub>)<sub>2</sub>C(OH)CH<sub>2</sub>O<sub>2</sub> Radical Self Reaction and Reaction with HO<sub>2</sub>
作者:Andrew A. Boyd、Robert Lesclaux、Michael E. Jenkin、Timothy J. Wallington
DOI:10.1021/jp953292c
日期:1996.4.18
A flash photolysis technique was used to measure the UVabsorptionspectrum of the peroxy radical (CH3)2C(OH)CH2O2 formed in the (CH3)3COH/Cl/O2 reaction system and to study the kinetics of its selfreaction and reaction with the HO2 radical at room temperature and above: 2(CH3)2C(OH)CH2O2 → 2(CH3)2C(OH)CH2O + O2 (5a); 2(CH3)2C(OH)CH2O2 → (CH3)2C(OH)CH2OH + (CH3)2C(OH)CHO + O2 (5b); (CH3)2C(OH)CH2O2
使用快速光解技术测量在(CH 3)3 COH / Cl / O 2反应体系中形成的过氧自由基(CH 3)2 C(OH)CH 2 O 2的紫外吸收光谱,并研究动力学自反应以及在室温及更高温度下与HO 2自由基的反应:2(CH 3)2 C(OH)CH 2 O 2 →2(CH 3)2 C(OH)CH 2 O + O 2(5a ); 2(CH 3)2 C(OH)CH 2 O 2→(CH 3)2 C(OH)CH 2 OH +(CH 3)2 C(OH)CHO + O 2(5b); (CH 3)2 C(OH)CH 2 O 2 + HO 2 →(CH 3)2 C(OH)CH 2 OOH + O 2(8)。该自由基的光谱在形式和大小上类似于其他β-羟基取代的过氧自由基的光谱。在系统的适当化学模型中使用该吸收截面和其他已知吸收截面可以得出k 5,支化比α(= k 5a / k5),并通过迭代过程得出k 8作为温度的函数(T
Chemistry of peroxidic tetrahedral intermediates of flavin
作者:Gabor Merenyi、Johan Lind
DOI:10.1021/ja00008a051
日期:1991.4
By means of pulse radiolysis 4a-peroxy intermediates of normal and 5-alkylated flavins were produced and the kinetics of their decay into flavin and the corresponding hydroperoxide was investigated as a function of the pH. The neutral and proton-catalyzed breakdown of the 4a-intermediates of 5-alkylated flavinium cations on the one hand and of 5-protio flavins on the other was very similar. It was
Study of (CH3)2C(OH)CH2O2 using modulated photolysis: ultra-violet spectrum and self-reaction kinetics
作者:A. Chakir、J. P. Ganne、E. Roth、J. Brion、D. Daumont
DOI:10.1039/b400392f
日期:——
bs[ClCH2CH2O2]2 corresponds to the global consumption of ClCH2CH2O2 radical via the reactions: ClCH2CH2O2 + ClCH2CH2O2 → ClCH2CH2O + ClCH2CH2O + O2 →ClCH2CH2OH + ClCH2CHO + O2 ClCH2CH2O2 + HO2 → ClCH2CH2O2H + O2 Using the branching ratio for the mutual reactions (Ia) and (Ib) of chloroethylperoxy radical—known at 298 K—the values of this parameter at 253K and 345 K are deduced and