α,β-C—C—C Agostic Bonding Interactions in Ruthenacyclobutane and π-Complex Assisted Olefin Metathesis Catalyzed by Ruthenium-Alkylidene Complexes

IF 2.3 3区 化学 Q3 CHEMISTRY, PHYSICAL International Journal of Quantum Chemistry Pub Date : 2024-10-08 DOI:10.1002/qua.27493
Carmen-Irena Mitan, Valerian Dragutan, Petru Filip
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Abstract

Computational aspects of concerted [2+2] oxidative-retrocycloaddition-cycloreversion reaction through ruthenium alkylidene π-complexes and ruthenacyclobutane with α,β-(C—C—C) agostic bonding interactions in olefin metathesis are presented. d6-Ruthenium carbene complexes, with ruthenium in the oxidation state +2, undergo successive [2+2] cycloaddition and cycloreversion steps, through associative, dissociative, or interchange mechanisms. This process involves coordination of the olefin to 16-electron Ru complex followed by phosphine dissociation, or first phosphine dissociation then coordination of the olefin to the 14-electron Ru complex with rearrangement to a ruthenacyclobutane intermediate, followed by symmetrical reverse steps. Donation of σ-electron density from the two C—C σ-bonds to the metal center leads to α,β-(C—C—C) agostic bonds, which stabilized metallacyclobutane as a formally 16-electron complex, with lower energy than the corresponding π-complex. In the transformation from π-complex to ruthenacyclobutane the ruthenium atom is formally oxidized to Ru(IV). The most efficient ligands are those that stabilize the high-oxidation state metallacyclobutane (IV) intermediate relative to the ruthenium carbene.

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钌-亚烷基络合物催化的钌环丁烷和 π-络合物辅助烯烃 Metathesis 中的α、β-C-C-C Agostic Bonding 相互作用
介绍了在烯烃复分解反应中,通过亚烷基钌π络合物和具有α,β-(C-C-C) agostic 键相互作用的环丁烷与钌发生协同[2+2]氧化-还原环加成-环氧化反应的计算问题。d6 碳化钌配合物中的钌处于氧化态 +2,通过缔合、离解或交换机制连续进行 [2+2] 环加成和环转化步骤。这一过程包括烯烃与 16 电子 Ru 复合物配位,然后膦解离,或者先是膦解离,然后烯烃与 14 电子 Ru 复合物配位,重排成钌环丁烷中间体,接着是对称的反向步骤。σ电子密度从两个 C-C σ键捐献给金属中心,导致α,β-(C-C-C)激动键,从而使金属环丁烷稳定为形式上的 16 电子络合物,其能量低于相应的 π-络合物。在从π-络合物转化为鲁钌环丁烷的过程中,钌原子被正式氧化为 Ru(IV)。最有效的配体是那些相对于碳化钌能稳定高氧化态金属环丁烷(IV)中间体的配体。
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来源期刊
International Journal of Quantum Chemistry
International Journal of Quantum Chemistry 化学-数学跨学科应用
CiteScore
4.70
自引率
4.50%
发文量
185
审稿时长
2 months
期刊介绍: Since its first formulation quantum chemistry has provided the conceptual and terminological framework necessary to understand atoms, molecules and the condensed matter. Over the past decades synergistic advances in the methodological developments, software and hardware have transformed quantum chemistry in a truly interdisciplinary science that has expanded beyond its traditional core of molecular sciences to fields as diverse as chemistry and catalysis, biophysics, nanotechnology and material science.
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