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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >One-electron-transfer reactions of polychlorinated ethylenes: Concerted and stepwise cleavages
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One-electron-transfer reactions of polychlorinated ethylenes: Concerted and stepwise cleavages

机译:多氯乙烯的单电子转移反应:一致裂解和逐步裂解

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摘要

Reaction barriers were calculated by using ab initio electronic structure methods for the reductive dechlorination of the polychlorinated ethylenes: C2O4, C2HCl3, trans-1,2-C2H2O2, cis-1,2-C2H2O2, 1,1-C2H2O and C2H3Cl. Concerted and stepwise cleavages of R-Cl bonds were considered. Stepwise cleavages yielded lower activation barriers than concerted cleavages for the reduction of C2O4, C2HCl3, and trarrs-1,2-C2H2Cl2 for strong reducing agents. However, for typical ranges of reducing strength concerted cleavages were found to be favored. Both gas-phase and aqueous-phase calculations predicted C2Cl4 to have the lowest reaction barrier. Additionally, the reduction of C2HCl3 was predicted to show selectivity toward formation of cis-1,2-C2HCl2 center dot over the formation of trans- 1,2-C2HCl2 center dot, and 1,1-C2HCl2 center dot radicals.
机译:通过使用从头算电子结构方法对多氯乙烯进行还原脱氯计算反应势垒:C2O4,C2HCl3,反式1,2-C2H2O2,顺式1,2-C2H2O2、1,1-C2H2O和C2H3Cl。考虑到R-Cl键的一致和逐步裂解。逐步裂解产生的活化壁垒比协同裂解产生的活化壁垒要少,对于强还原剂来说,C12O4,C2HCl3和trarrs-1,2-C2H2Cl2的裂解比协同裂解要低。然而,对于降低强度的典型范围,发现一致的分裂是有利的。气相和水相计算均预测C2Cl4具有最低的反应势垒。另外,预测C 2 HCl 3的还原显示出比形成反式1,2-C 2 HCl 2中心点和1,1-C 2 HCl 2中心点自由基更倾向于形成顺式1,2-C 2 HCl 2中心点。

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