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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Ab Initio Study of Cyclobutadieno-p-benzoquinones: Kekule Isomerization or Not?
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Ab Initio Study of Cyclobutadieno-p-benzoquinones: Kekule Isomerization or Not?

机译:从头开始进行环丁二烯对苯醌的研究:屈曲异构化与否?

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摘要

The problem of the existence of two Kekule isomers 1a and 1b of cyclobutadieno-p-benzoquinone is addressed by the CAS(10, 10)/6-31G~*//GVB(2)/6-31G~* and CASPT2(10, 10)/ANO(3s2-1d,2s1p)//GVB(2)/6-31G~* theoretical models. It is shown that the barrier separating these isomers on the Born-Oppenheimer surface practically disappears if the zero-point vibrational energies are taken into account. The angular strain and antiaromaticity of the more stable isomer 1a are estimated by employing the appropriate homodesmic reactions. It is concluded that 1a should be experimentally isolable, albeit in extreme conditions.
机译:CAS(10,10)/ 6-31G〜* // GVB(2)/ 6-31G〜*和CASPT2(10)解决了环丁二烯对苯醌的两个Kekule异构体1a和1b存在的问题,10)/ ANO(3s2-1d,2s1p)// GVB(2)/ 6-31G〜*理论模型。结果表明,如果考虑零点振动能,则在Born-Oppenheimer表面上将这些异构体隔开的势垒实际上消失了。更稳定的异构体1a的角应变和抗芳构性通过采用适当的同位反应来估算。结论是,即使在极端条件下,1a也应在实验上是可分离的。

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