Synlett 2023; 34(10): 1129-1134
DOI: 10.1055/a-1928-2473
cluster
Dispersion Effects

London Dispersion Stabilizes Chloro-Substituted cis-Double Bonds

a   Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
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a   Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
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b   Institute of Inorganic and Analytical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
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a   Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
› Author Affiliations
This work was supported by the priority program ‘Control of London Dispersion in Molecular Chemistry’ (SPP1807) of the Deutsche Forschungsgemeinschaft.


Abstract

We present a combined experimental and computational study on the thermodynamic stability of cis- and trans-alkenes substituted with dispersion energy donor (DED) groups. To investigate the role of noncovalent interactions on equilibrium of cis- and trans-alkenes we utilized hydrochlorination reactions. While the general assumption is that increasing steric bulk favors the trans-alkene, we observe an equilibrium shift towards the more crowded cis-alkene with increasing substituent size. With the aim to quantify noncovalent interactions, we performed a double mutant cycle to experimentally gauge the attractive potential of bulky substituents. Additionally, we utilized local energy decomposition analysis at the DLPNO-CCSD(T)/def2-TZVP level of theory. We found LD interactions and Pauli exchange repulsion to be the most dominant components to influence cis- and trans-alkene equilibria.

Supporting Information



Publication History

Received: 07 July 2022

Accepted after revision: 19 August 2022

Accepted Manuscript online:
19 August 2022

Article published online:
30 September 2022

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