Kinetics of the Thermal Decomposition of Substituted Cyclic Organic Peroxides in Toluene Solution: Substituent Effects on the Reaction Rates and the Activation Parameters of the Unimolecular Reactions
作者:Adriana I. Cañizo、Gladys N. Eyler、Carmen M. Mateo、Elida E. Alvarez、Rosa K. Nesprías
DOI:10.3987/com-04-10128
日期:——
Thermaldecomposition reactions of substituted cyclic organic di- and triperoxides have been carried out in toluene solution in order to investigate substituenteffects on homolytic scission of the O-O bond in those compounds. A comparative analysis of the reactivities at 145 °C and the activation parameters for unimolecular reactions of molecules of this type were interpreted in terms of substituent
为了研究取代基对这些化合物中 OO 键均裂的影响,已在甲苯溶液中进行了取代的环状有机二过氧化物和三过氧化物的热分解反应。对 145 °C 下的反应性和此类分子的单分子反应的活化参数的比较分析根据取代基效应和环大小进行了解释。建立等速关系以验证所考虑物质的单分子均裂反应存在真正的取代基效应。具有非常高反应性和空间位阻的环状有机过氧化物偏离了相关性。似乎可以根据活化参数值确定过氧基是六元环还是九元环的一部分。
Mono, Di and Trifunctional Cyclic Organic Peroxides: The Effect of Substituents and Ring Size on their Thermolysis in 1,4-dioxan
作者:Rosa Nesprias、Gladys Eyler、Adriana Cañizo
DOI:10.1071/ch13171
日期:——
cyclic organic peroxides was studied in 1,4-dioxan at initial concentrations between ~10–4 and 10–2 mol L–1 and at a temperature interval between 100 and 170°C, according to the thermal stability of each compound. The kinetic behaviour observed in all systems studied follows a pseudo first order kinetic law up to at least ~86 % of peroxide conversion. An important substituent effect is operative on
在1,4-二恶烷中以约10 –4到10 –2 mol L –1的初始浓度研究了环状有机过氧化物的热分解反应根据每种化合物的热稳定性,以100至170°C的温度间隔进行。在所有研究的系统中观察到的动力学行为遵循伪一级动力学定律,直到过氧化物转化率至少达到〜86%。重要的取代基效应作用于速率常数值,因此作用于热分解反应的活化参数。在动力学数据上应用不同的处理方法(补偿影响或统计学处理)表明,存在两组具有相似动力学行为的环状过氧化物。在每个系列中可以考虑不同的过氧化物与溶剂的相互作用机理。
Synthesis and antimalarial activities of novel 3,3,6,6-tetraalkyl-1,2,4,5-tetraoxanes
The oxidative system H2O2/fluorinated alcohol (TFE, HF1P) was used for direct acid- and MeRCO3-catalyzed synthesis of 1,2,4,5-tetraoxanes from cyclic (C6, C7, and C12) and acyclic ketones. The influence of ring size and alkyl chain length were studied and antimalarial activities of synthetic 3,3,6,6-tetraalkyl-1,2,4,5-tetraoxanes were determined. Variations in their antimalarial activities were significant, although they share similar electrochemical properties of the peroxide bond. (c) 2006 Elsevier Ltd. All rights reserved.