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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Orbital signatures as a descriptor of regioselectivity and chemical reactivity: The role of the frontier orbitals on 1,3-dipolar cycloadditions
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Orbital signatures as a descriptor of regioselectivity and chemical reactivity: The role of the frontier orbitals on 1,3-dipolar cycloadditions

机译:轨道标记作为区域选择性和化学反应性的描述:前沿轨道在1,3-偶极环加成反应中的作用

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摘要

The FERMO concept emerges as a powerful and innovative implement to investigate the role of molecular orbitals applied to the description of breakage and formation of chemical bonds. In this work, Hartree-Fock (HF) theory and density functional (DFT) calculations were performed for a series of four reactions of 1,3-dipolar cycloadditions and were analyzed by molecular orbital (MO) energies, charge transfer, and molecular dynamics (ADMP) techniques for direct dynamics using the DFT method. The regioselectivity for a series of four 1,3-dipolar cycloaddition reactions was studied here using global and local reactivity indexes. We observed that the HOMO energies are insufficient to describe the behavior of these reactions when there is the presence of heteroatoms. By using the frontier effective-for-reaction molecular orbital (FERMO) concept, the reactions that are driven by HOMO, and those that are not, can be better explained, independent of the calculation method used, because both HF and Kohn-Sham methodologies lead to the same FERMO.
机译:FERMO概念是一种功能强大且创新的工具,可用来研究分子轨道在描述化学键断裂和形成中的作用。在这项工作中,对1,3-偶极环加成反应的一系列四个反应进行了Hartree-Fock(HF)理论和密度泛函(DFT)计算,并通过分子轨道(MO)能量,电荷转移和分子动力学进行了分析。 (ADMP)技术使用DFT方法进行直接动力学处理。在这里使用全局和局部反应指数研究了一系列四个1,3-偶极环加成反应的区域选择性。我们观察到,当存在杂原子时,HOMO能量不足以描述这些反应的行为。通过使用前沿有效反应分子轨道(FERMO)概念,可以更好地解释由HOMO驱动的反应和未由HOMO驱动的反应,而与所使用的计算方法无关,因为HF和Kohn-Sham方法导致相同的FERMO。

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