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首页> 外文期刊>Organometallics >The asymmetric Schrock olefin metathesis catalyst. A computational study
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The asymmetric Schrock olefin metathesis catalyst. A computational study

机译:不对称Schrock烯烃复分解催化剂。计算研究

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摘要

The mechanism of the transition metal catalyzed olefin metathesis reaction with the Schrock catalyst is investigated with pure (BP86) and hybrid (B3LYP) density functional theory. On the free-energy surface there is no adduct between ethylene and model catalyst (MeO)(2)Mo(CH2)NH but instead a single transition on a flat surface giving a metallacyclo-butane with a trigonal bipyramidal conformation that has a sizable barrier for conversion to the square pyramidal form. The model was expanded to the active asymmetric Schrock catalyst and investigated with QM/MM, using BP86 for the QM part and AMBER 95 for the MM part, for the experimentally known ring-closing metathesis of a symmetrical triene. The factors effecting chiral induction to the observed product are delineated.
机译:用纯(BP86)和杂化(B3LYP)密度泛函理论研究了过渡金属催化的烯烃与Schrock催化剂的复分解反应机理。在自由能表面上,乙烯与模型催化剂(MeO)(2)Mo(CH2)NH之间没有加合物,而是在平坦表面上进行了一次过渡,产生了具有双三角锥体构象且具有相当大的势垒的金属环丁烷转换为方形金字塔形。该模型已扩展为活性不对称Schrock催化剂,并通过QM / MM进行了研究,其中BP86用于QM部分,而AMBER 95用于MM部分,用于实验已知的对称三烯的闭环复分解反应。描绘了影响所观察产物手性诱导的因素。

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