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:
影响因子:
--
通讯作者:
Meyer,MatthewP
中科院分区:
文献类型:
--
作者:
Li,Xiao;York,DarrinM;Meyer,MatthewP
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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DOI:
10.1073/pnas.88.21.9392
发表时间:
1991-11-01
影响因子:
11.1
作者:
ELION, EA;BRILL, JA;FINK, GR
通讯作者:
FINK, GR
DOI:
--
发表时间:
1989-12
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
P. Cohen;P. Cohen
通讯作者:
P. Cohen;P. Cohen
DOI:
--
发表时间:
1988
期刊:
Oncogene research
影响因子:
--
作者:
Potts,WM;Reynolds,AB;Lansing,TJ;Parsons,JT
通讯作者:
Parsons,JT
DOI:
10.1016/0006-291x(90)91161-k
发表时间:
1990
影响因子:
3.1
作者:
Miyasaka,T;Miyasaka,J;Saltiel,AR
通讯作者:
Saltiel,AR
DOI:
10.1016/s0021-9258(18)54918-8
发表时间:
1991-10
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
A. Rossomando;J. Sanghera;L. Marsden;Michael J. Weber;S. Pelech;T. Sturgill
通讯作者:
A. Rossomando;J. Sanghera;L. Marsden;Michael J. Weber;S. Pelech;T. Sturgill