Rate constants for the reaction of the hydrogen atom with aliphatic ketones in water
作者:Stephen P. Mezyk、Annett Lossack、David M. Bartels
DOI:10.1139/v97-133
日期:1997.8.1
20.69 ± 0.31, 18.73 ± 0.36, 22.24 ± 0.80, and 22.30 ± 1.04 kJ mol−1 were determined, respectively. Competition kinetic measurements based on total H2 yields have established that for all of these ketones the dominant hydrogen atom reaction path is by •H atom abstraction. The new activation energy for 2-butanone is much lower than the previously reported value of 40.1 ± 0.7 kJ mol−1 with this difference
氢原子与水溶液中的 3-甲基-2-丁酮、3-戊酮、环戊酮、4-甲基-2-戊酮和 2-丁酮反应的 Arrhenius 参数已直接由电子顺磁共振自由感应衰减计算得出( FID) 衰减测量。对于这些化合物,25.0 °C 下的绝对清除速率常数为 (8.84 ± 0.26) × 107、(4.20 ± 0.15) × 107、(4.91 ± 0.28) × 107、(3.25 ± 0.27) × 107 和 (2.20) × 107 ) × 107 dm3 mol−1 s−1, 相应的活化能分别为 17.43 ± 0.29, 20.69 ± 0.31, 18.73 ± 0.36, 22.24 ± 0.80, 和 22.30 ± 1.04 kJ mol。基于总 H2 产率的竞争动力学测量已经确定,对于所有这些酮,主要的氢原子反应路径是通过 •H 原子提取。