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。
The Decomposition ofcis-Fused Cyclopenteno-1,2,4-Trioxanes induced by Ferrous Salts and some oxophilic reagents
作者:Charles W. Jefford、France Favarger、Maria Da Gra�a H. Vicente、Yvan Jacquier
DOI:10.1002/hlca.19950780216
日期:1995.3.22
Two cis-fused cyclopenteno-1,2,4-trioxanes, 1a and 1b, were subjected to Zn in AcOH or FeCl2 · 4H2O in MeCN. In the first case, the main course was deoxygenation to give cyclopentanone (18) and the 1,4-diphenyl- or 1,4-bis(4-fluorophenyl)cyclopent-3-ene-1,2-diol 10 (Scheme 5). In the second case, isomerization chiefly occurred resulting in the formation of a dimer 9 of the respective 3,5-diaryl-5-
The osmium-catalyzed asymmetric dihydroxylation of cis-fused cyclopenteno-1,2,4-trioxanes
作者:Charles W. Jefford、Dharmendra Misra、Allan P. Dishington、Géza Timari、Jean-Claude Rossier、Gérald Bernardinelli
DOI:10.1016/s0040-4039(00)73410-1
日期:1994.8
Submission of racemic, cis-fused cyclopenteno-1,2,4-trioxanes (1 and 1-ent) to catalytic amounts of K2OsO4 and (DHQD)(2)PHAL and 1.2 equivalents of N-methylmorpholine N-oxide in aqueous acetone at 20 degrees C (hybrid AD-mix-beta) for 2 h gave the (-)-enantiomer, 1-ent (ee 95%) in 30% yield. The same reaction, but with (DHQ)(2)PHAL, (hybrid AD-mix-alpha) afforded the (+)-enantiomer, 1 (ee 95%) in 25% yield after 2.7 h reaction. Similar, efficient kinetic resolution of the racemic di-p-fluoro analogues (2 and 2-ent) was also achieved with the same reagents.