首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Activation of H-H,C-H,C-C,and C-C1 Bonds by Pd(0).Insight from the Activation Strain Model
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Activation of H-H,C-H,C-C,and C-C1 Bonds by Pd(0).Insight from the Activation Strain Model

机译:通过Pd(0)激活H-H,C-H,C-C和C-C1键从激活应变模型中了解

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摘要

To achieve more insight into palladium-catalyzed H-H,C-H,C-C,and C-Cl bond activation and the mutual competition between these processes,several mechanistic pathways for oxidative addition of Pd(0) to H_2 (H-H),CH_4 (C-H),C_2H_6 (C-C and C-H),and CH_3C1 (C-C1) were studied uniformly at the ZORA-BP86/TZ(2)P level of relativistic nonlocal density functional theory (DFT).Oxidative addition is overall exothermic for all model reactions studied,with 298 K reaction enthalpies (DELTAH_r_(298)) of -35.7 kcal/mol (C- Cl) through -9.7 kcal/mol (C-H in CH_4).The lowest barrier pathway is the direct oxidative insertion of Pd into the C-X or H-H bond (X=H,CH_3,Cl),with 298 K activation enthalpies (DELTAH_(298)) that increase in the order H-H (-21.7 kcal/mol)
机译:为了更深入地了解钯催化的HH,CH,CC和C-Cl键的活化以及这些过程之间的相互竞争,提出了将Pd(0)氧化添加到H_2(HH),CH_4(CH)的几种机理,在相对论非局部密度泛函理论(DFT)的ZORA-BP86 / TZ(2)P水平上对C_2H_6(CC和CH)和CH_3C1(C-C1)进行了统一研究。氧化加成是所有研究的模型反应的总体放热反应, 298 K反应焓(DELTAH_r_(298))为-35.7 kcal / mol(C- Cl)到-9.7 kcal / mol(CH_4中的CH)。最低的阻隔途径是Pd直接氧化插入CX或HH键(X = H,CH_3,Cl),具有298 K活化焓(DELTAH_(298)),以HH(-21.7 kcal / mol)

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