Quantum Suppression of Intramolecular Deuterium Kinetic Isotope Effects in a Pericyclic Hydrogen Transfer Reaction.

Quantum Suppression of Intramolecular Deuterium Kinetic Isotope Effects in a Pericyclic Hydrogen Transfer Reaction.
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周环氢转移反应中分子内氘动力学同位素效应的量子抑制。

DOI:
10.1021/acs.jpca.9b00172
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发表时间:
2019
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
Meyer,MatthewP
Meyer,MatthewP
中科院分区:
--
文献类型:
--
作者:
Li,Xiao;York,DarrinM;Meyer,MatthewP

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一般认为,氢隧穿增强了初级和次级H/D动力学同位素效应(KIE),超过了经典势垒跃迁假设下的预期。先前的研究已经专门表明,隧道效应对初级H/D KIE的影响要比对次级H/D KIE观察到的大得多。本文介绍了在180 ~ 290 °C温度范围内,β-苯基乙醇衍生的甲基黄原酸酯的Chugaev消除反应的H/D KIE实验结果。根据经典过渡态理论(TST)计算的分子内H/D KIE相对于实验测量值明显高估。分子间H/D KIE的实验和基于正则变分过渡态理论(CVT)的小曲率隧道效应(SCT)的直接动力学计算表明,这一结果在很大程度上是这些次H/D KIE的异常隧穿增强的结果.在其他类似的氢转移反应的背景下,这种意想不到的行为进行检查。
It is generally accepted that hydrogen tunneling enhances both primary and secondary H/D kinetic isotope effects (KIEs) over what would be expected under the assumptions of classical barrier transition. Previous studies have exclusively shown that the effects of tunneling upon primary H/D KIEs have been much larger than those observed for secondary H/D KIEs. Here we present a series of experimental H/D KIE results associated with the Chugaev elimination of methyl xanthate derived from β-phenylethanol over the temperature range of 180 to 290 °C. Intramolecular H/D KIEs computed according to classical transition state theory (TST) are markedly overestimated relative to experimentally measured values. Experimental intermolecular H/D KIEs and direct dynamic calculations based on canonical variational transition state theory (CVT) with small-curvature tunneling correction (SCT) reveal that this result is largely the consequence of extraordinary tunneling enhancement of thesecondaryH/D KIE. This unexpected behavior is examined in the context of other similar hydrogen transfer reactions.
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