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Theoretical investigation of alkyne metathesis catalyzed by W/Mo alkylidyne complexes

机译:W / Mo亚烷基配合物催化炔烃复分解的理论研究

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In this paper, the mechanism of alkyne metathesis catalyzed by W/Mo alkylidyne complexes has been theoretically investigated with the aid of density functional theory calculations. Calculations on various model alkylidyne complexes M( CMe)(OR)(3) (M = W, Mo; R = Me, CH2F), W( CMe)(NMe2)(3), and W( CMe)(Cl)(3) allow us to examine the factors that influence the reaction barriers. In the reaction mechanism, metallacyclobutadienes are initially formed from a ring-closing step between alkynes and alkylidyne complexes. A ring-opening step then gives the metathesis products. The factors that determine the metathesis reaction barriers have been examined. The reaction paths leading to the formation of Cp complexes, a possible path deactivating catalytic activity, were also studied.
机译:本文在密度泛函理论计算的基础上,对W / Mo亚烷基络合物催化的炔烃复分解机理进行了理论研究。计算各种模型亚烷基络合物M(CMe)(OR)(3)(M = W,Mo; R = Me,CH2F),W(CMe)(NMe2)(3)和W(CMe)(Cl)( 3)让我们研究影响反应壁垒的因素。在反应机理中,金属环丁二烯最初是由炔烃和亚烷基络合物之间的闭环步骤形成的。然后开环步骤得到复分解产物。已经检查了确定复分解反应障碍的因素。还研究了导致Cp络合物形成的反应途径,这是一种可能使催化活性失活的途径。

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