| CHEMISTRY OF THE PERFLUORO AND POLYFLUORO ORGANIC COMPOUNDS——THE RELATIVE EASE OF FORMATION OF TWO PERFLUOROALKYL R ADICALS |
| |
| 引用本文： | 潘鹤岐,吴成九,徐天霏,蒋锡夔.CHEMISTRY OF THE PERFLUORO AND POLYFLUORO ORGANIC COMPOUNDS——THE RELATIVE EASE OF FORMATION OF TWO PERFLUOROALKYL R ADICALS[J].中国科学B辑(英文版),1985(8). |
| |
| 作者姓名： | 潘鹤岐 吴成九 徐天霏 蒋锡夔 |
| |
| 作者单位： | Shanghai Institute of Organic Chemistry，Academia Sinica，Shanghai Institute of Organic Chemistry，Academia Sinica，Shanghai Institute of Organic Chemistry，Academia Sinica，Shanghai Institute of Organic Chemistry，Academia Sinica |
| |
| 摘 要： | The relative rates of formation of perfluoro iso-propyl radicals (i—C_3F_7,5(i)) and perfluoro n-propyl radicals (n—G_3F_7, 5(n)) are reported. The relative rate constants of β-scission and of bromine abstraction by perfluoro-(α-alkoxyethyl)radicals(RFOCFCF_3:R_F=i—C_3F_7, 3(i); R_F=C_3F_, 3(n)), designated as kr(i) and k,(n), were measured at 7 temperatures in the range of 50—80℃, thence the ratio of the relative rate constants of formation of perfluoro iso-propyl radicals (5(i) and perfluoro n-propyl radicals (5(n)), K_β(i):K_β(n), were obtained. These ratios range from 540—680 at 50℃ to 400—590 at 80℃, much larger than those of the corresponding hydrocarbon radicals. Finally, the differences of activation-free-energy differences between 3(i) and 3 (n), △G~≠(i—n), together with the corresponding enthalpy and entropy terms, △H~≠(i—n), △S~≠(i- n), were calculated. These kinetic parameters indicate that the much higher rate of formation of the perfluoro iso-propyl radicals is caused
|
| 本文献已被 CNKI 等数据库收录！ |
|
