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Title: Prediction of enhanced solvent-induced enantioselectivity for a ring opening with a bifurcating reaction path

Abstract

Classical molecular dynamics simulations are reported for the deazetisation and ring opening of meso-2,3-difluoro-2,3-dimethyldiazocyclopropane in three solvents: CHCl3, CHFClBr and CH3CH(OH)CF3 (TFIPA). In this study, the achiral reactant leads to enantiomeric allene products, and the question addressed in the study is whether either of the chiral, enantiomerically pure solvents can induce significant enantiomeric excess in the products. The direct dynamics calculations use an empirical valence bond potential for the solute, with empirical parameters optimised against M06-2X/cc-pVTZ density functional results. The results reveal that the exothermic N2 loss and ring opening promote transient strong solvent–solute interactions within the first ~100 fs of the reaction. Because of the bifurcating reaction path, these interactions occur at time when the “decision” about which enantiomer of the product to form has yet to be made (at least for many of the trajectories). Hence, it is possible in principle that the solvent could exert a larger-than-normal influence on the course of the reaction. In fact, the results reveal no such effect for CHFClBr but do predict that TFIPA should induce 15.2 ± 2.1% enantiomeric excess. This is roughly an order of magnitude larger than solvent-induced enantiomeric excesses found experimentally in reactions where the conversion of reactant(s)more » to enantiomeric products occur over separate transition states.« less

Authors:
 [1];  [2];  [3]
+ Show Author Affiliations
  1. Cardiff Univ., Cardiff (United Kingdom)
  2. KU Leuven, Heverlee (Belgium)
  3. Univ. of Bristol, Bristol (United Kingdom); Stanford Univ., Stanford, CA (United Kingdom); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1233171
Grant/Contract Number:  
EP/K000489/1; EP/L005913/1; AC03-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP
Additional Journal Information:
Journal Volume: 17; Journal Issue: 13; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Carpenter, Barry K., Harvey, Jeremy N., and Glowacki, David R. Prediction of enhanced solvent-induced enantioselectivity for a ring opening with a bifurcating reaction path. United States: N. p., 2014. Web. doi:10.1039/C4CP05078A.
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Carpenter, Barry K., Harvey, Jeremy N., & Glowacki, David R. Prediction of enhanced solvent-induced enantioselectivity for a ring opening with a bifurcating reaction path. United States. https://doi.org/10.1039/C4CP05078A
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Carpenter, Barry K., Harvey, Jeremy N., and Glowacki, David R. Thu . "Prediction of enhanced solvent-induced enantioselectivity for a ring opening with a bifurcating reaction path". United States. https://doi.org/10.1039/C4CP05078A. https://www.osti.gov/servlets/purl/1233171.
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@article{osti_1233171,
title = {Prediction of enhanced solvent-induced enantioselectivity for a ring opening with a bifurcating reaction path},
author = {Carpenter, Barry K. and Harvey, Jeremy N. and Glowacki, David R.},
abstractNote = {Classical molecular dynamics simulations are reported for the deazetisation and ring opening of meso-2,3-difluoro-2,3-dimethyldiazocyclopropane in three solvents: CHCl3, CHFClBr and CH3CH(OH)CF3 (TFIPA). In this study, the achiral reactant leads to enantiomeric allene products, and the question addressed in the study is whether either of the chiral, enantiomerically pure solvents can induce significant enantiomeric excess in the products. The direct dynamics calculations use an empirical valence bond potential for the solute, with empirical parameters optimised against M06-2X/cc-pVTZ density functional results. The results reveal that the exothermic N2 loss and ring opening promote transient strong solvent–solute interactions within the first ~100 fs of the reaction. Because of the bifurcating reaction path, these interactions occur at time when the “decision” about which enantiomer of the product to form has yet to be made (at least for many of the trajectories). Hence, it is possible in principle that the solvent could exert a larger-than-normal influence on the course of the reaction. In fact, the results reveal no such effect for CHFClBr but do predict that TFIPA should induce 15.2 ± 2.1% enantiomeric excess. This is roughly an order of magnitude larger than solvent-induced enantiomeric excesses found experimentally in reactions where the conversion of reactant(s) to enantiomeric products occur over separate transition states.},
doi = {10.1039/C4CP05078A},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 13,
volume = 17,
place = {United States},
year = {Thu Dec 11 00:00:00 EST 2014},
month = {Thu Dec 11 00:00:00 EST 2014}
}
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https://doi.org/10.1039/C4CP05078A
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