Unimolecular Reaction Kinetics of CF<sub>2</sub>ClCF<sub>2</sub>CH<sub>3</sub> and CF<sub>2</sub>ClCF<sub>2</sub>CD<sub>3</sub>: Experimental Evidence for a Novel 1,2-FCl Rearrangement Pathway
作者:Maria O. Burgin、George L. Heard、Jaime M. Martell、Bert E. Holmes
DOI:10.1021/jp002511d
日期:2001.3.8
internal energy, respectively, were formed in the gas phase from the combination of CF2ClCF2 and CH3 or CD3 radicals, respectively. These radicals were generated from the UV photolysis of CF2ClCF2I and CH3I or CD3I. The decomposition products were CF2ClCFCH2 (CF2ClCFCD2) from a 2,3-HF (DF) elimination and CF3CFCH2 (CF3CFCD2) suggesting a 1,3-HCl (DCl) elimination reaction. The 1,3-HCl elimination mechanism
化学活化的 CF2ClCF2CH3 和 CF2ClCF2CD3 分别含有 98.5 和 100 kcal/mol 的内能,在气相中分别由 CF2ClCF2 和 CH3 或 CD3 自由基的组合形成。这些自由基是由 CF2ClCF2I 和 CH3I 或 CD3I 的紫外光解产生的。分解产物是来自 2,3-HF (DF) 消除的 CF2ClCFCH2 (CF2ClCFCD2) 和表明 1,3-HCl (DCl) 消除反应的 CF3CFCH2 (CF3CFCD2)。1,3-HCl 消除机制似乎是一个两步过程。1,2-FCl 重排,产生 CF3ClCFClCH3 (CF3CFClCD3),然后是 2,3-HCl (DCl) 消除。对于 2,3-HF (DF) 损失,CF2ClCF2CH3 (CF2ClCF2CD3) 的单分子速率常数为 5.3 ± 2.1 × 105 s-1 (1.8 ± 0.7 ×