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Thermal rearrangements of 1-ethynyl-2-methylcyclopropane: A computational study

机译:1-乙炔基-2-甲基环丙烷的热重排:计算研究

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In this research, a comprehensive theoretical investigation of the thermal rearrangements of 1-ethynyl-2-methylcyclopropane is carried out employing density functional theory (DFT), with the B3LYP functional, and high-level ab initio methods, such as the complete active space self-consistent field (CASSCF), multireference second-order M?ller-Plesset perturbation theory (MRMP2), and coupled-cluster singles and doubles with perturbative triples [CCSD(T)]. In all computations Poples polarized triple-ζ split valence basis set, 6-311G(d,p), is utilized. The potential energy surface (PES) for the relevant system is explored to provide a theoretical account of the experiments by Hopf,(1-4) Ellis and Frey,(5) Huntsman et al.,(6) and Berson.(7) The computational results herein on the target system show that the thermal aromatization reaction does not proceed via conversion of 1,2,5-hexatriene (2) to 1,3,5-hexatriene (10a) as proposed by Hopf.(1-4) Indeed, the reaction proceeds via conversion of 5 and 6 to bicyclo[3.1.0]hexene (9) as suggested by Huntsman et al.(6)
机译:在这项研究中,使用密度泛函理论(DFT),B3LYP泛函和高级从头算方法,例如完整的活性空间,对1-乙炔基-2-甲基环丙烷的热重排进行了全面的理论研究。自洽场(CASSCF),多参考二阶M?ller-Plesset扰动理论(MRMP2)以及带有扰动三元组的耦合集群单打和双打[CCSD(T)]。在所有计算中,都使用了Poples极化的三元ζ分裂价基集6-311G(d,p)。探索了相关系统的势能面(PES),为Hopf,(1-4)Ellis和Frey,(5)Huntsman等人,(6)和Berson。(7)的实验提供了理论依据。在目标系统上的计算结果表明,如Hopf所述,热芳构化反应不会通过将1,2,5-己三烯(2)转化为1,3,5-己三烯(10a)进行。 )实际上,如Huntsman等人(6)所述,反应是通过5和6转化为双环[3.1.0]己烯(9)进行的。

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