乙烯与1,3-丁二烯的Diels-Alder反应:一个扩展的多参考文献从头算研究

IF 2.3 3区 化学 Q3 CHEMISTRY, PHYSICAL
Hans Lischka Prof. Dr., Elizete Ventura Dr., Michal Dallos Dr.
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引用次数: 37

摘要

采用高相关多参考方法(MRAQCC)和扩展基集研究了1,3-丁二烯与乙烯的Diels-Alder反应的协调和分步机理。在所有情况下都执行了完整的MRAQCC几何优化。Diels-Alder反应能垒的最佳估计为22千卡摩尔−1。确定了双基结构的抗扭出最小值和扭出最小值以及相应的断裂鞍点。双自由基抗破碎鞍点位于协调鞍点上方6.5 kcal mol−1。内旋结构不符合局部最小值,而是直接导致环己烯的几何优化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The Diels–Alder Reaction of Ethene and 1,3-Butadiene: An Extended Multireference ab initio Investigation

The Diels–Alder Reaction of Ethene and 1,3-Butadiene: An Extended Multireference ab initio Investigation

The concerted and stepwise mechanisms of the Diels–Alder reaction between 1,3-butadiene and ethene have been investigated using highly correlated multireference methods (MRAQCC) and extended basis sets. Full MRAQCC geometry optimizations have been performed in all cases. The best estimate for the energy barrier of the Diels–Alder reaction is 22 kcal mol−1. Anti- and gauche-out minima for the biradical structures and corresponding fragmentation saddle points have been determined. The biradical anti fragmentation saddle point is located 6.5 kcal mol−1 above the concerted saddle point. The gauche-in structure does not correspond to a local minimum, but leads on geometry optimization directly to cyclohexene.

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来源期刊
Chemphyschem
Chemphyschem 化学-物理:原子、分子和化学物理
CiteScore
4.60
自引率
3.40%
发文量
425
审稿时长
1.1 months
期刊介绍: ChemPhysChem is one of the leading chemistry/physics interdisciplinary journals (ISI Impact Factor 2018: 3.077) for physical chemistry and chemical physics. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies. ChemPhysChem is an international source for important primary and critical secondary information across the whole field of physical chemistry and chemical physics. It integrates this wide and flourishing field ranging from Solid State and Soft-Matter Research, Electro- and Photochemistry, Femtochemistry and Nanotechnology, Complex Systems, Single-Molecule Research, Clusters and Colloids, Catalysis and Surface Science, Biophysics and Physical Biochemistry, Atmospheric and Environmental Chemistry, and many more topics. ChemPhysChem is peer-reviewed.
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