首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ab Initio/GIAO-CCSD(T)Study of Propenoyl(H_2C=CH-CO~+)and Isopentenoyl((CH_3)_2C=CH-CO~+)Cations and Their Superelectrophilic Protonated Dications
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Ab Initio/GIAO-CCSD(T)Study of Propenoyl(H_2C=CH-CO~+)and Isopentenoyl((CH_3)_2C=CH-CO~+)Cations and Their Superelectrophilic Protonated Dications

机译:炔丙基(H_2C = CH-CO〜+)和异戊烯酰基((CH_3)_2C = CH-CO〜+)阳离子及其超亲电质子化阳离子的从头算/ GIAO-CCSD(T)研究

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摘要

Structures of Superelectrophilic protonated propenoyl(H_2C=CH-COH~(2+))and opentenoyl((CH_3)_2C=CH- COH~(2+))dications and their parent cations were calculated using ab initio methods at the MP2/6-311+G** and MP2/cc-pVTZ levels.Energies were calculated using Gaussian-2(G2)theory.The alpha-carbon(C_alpha)protonated 3 and 7 were found to be the global minima for protonated propenoyl and isopentenoyl dications,respectively.~(13)C NMR chemical shifts of the cations were also calculated using the GIAO-CCSD(T),GIAO-MP2 and GIAO-SCF methods.~(13)C NMR chemical shifts of the related tert-butyl cation((CH_3)_3C~+)and protonated tert-butyl dication((CH_3)_2CCH_4~(2+))were also computed at the same level to compare and explore the effect of the additional charge in dications.
机译:在MP2 / 6上使用从头算方法计算了超亲电质子化的丙烯酰基(H_2C = CH-COH〜(2+))和戊烯酰基((CH_3)_2C = CH- COH〜(2+))的结构以及它们的母阳离子-311 + G **和MP2 / cc-pVTZ水平。使用高斯2(G2)理论计算能量,发现质子化的丙烯酰基和异戊烯酰基指示剂的α-碳(C_alpha)质子化3和7是全局最小值分别使用GIAO-CCSD(T),GIAO-MP2和GIAO-SCF方法计算了阳离子的(13)C NMR化学位移。相关叔丁基阳离子的(13)C NMR化学位移还计算了((CH_3)_3C〜+)和质子化的叔丁基指示剂((CH_3)_2CCH_4〜(2+)),以比较和探索附加电荷在指示剂中的作用。

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