Dumon, Alexandre S;
Rzepa, Henry S;
Alamillo-Ferrer, Carla;
Bures, Jordi;
Procter, Richard;
Sheppard, Tom D;
Whiting, Andrew;
(2022)
A computational tool to accurately and quickly predict ¹⁹F NMR chemical shifts of molecules with fluorine–carbon and fluorine–boron bonds.
Physical Chemistry Chemical Physics
10.1039/d2cp02317b.
(In press).
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Abstract
We report the evaluation of density-functional-theory (DFT) based procedures for predicting 19F NMR chemical shifts at modest computational cost for a range of molecules with fluorine bonds, to be used as a tool for assisting the characterisation of reaction intermediates and products and as an aid to identifying mechanistic pathways. The results for a balanced learning set of molecules were then checked using two further testing sets, resulting in the recommendation of the ωB97XD/aug-cc-pvdz DFT method and basis set as having the best combination of accuracy and computational time, with a RMS error of 3.57 ppm. Cationic molecules calculated without counter-anion showed normal errors, whilst anionic molecules showed somewhat larger errors. The method was applied to the prediction of the conformationally averaged 19F chemical shifts of 2,2,3,3,4,4,5,5-octafluoropentan-1-ol, in which gauche stereoelectronic effects involving fluorine dominate and to determining the position of coordination equilibria of fluorinated boranes as an aid to verifying the relative energies of intermediate species involved in catalytic amidation reactions involving boron catalysts.
Type: | Article |
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Title: | A computational tool to accurately and quickly predict ¹⁹F NMR chemical shifts of molecules with fluorine–carbon and fluorine–boron bonds |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1039/d2cp02317b |
Publisher version: | https://doi.org/10.1039/d2cp02317b |
Language: | English |
Additional information: | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (http://creativecommons.org/licenses/by/3.0/). |
UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
URI: | https://discovery.ucl.ac.uk/id/eprint/10154264 |
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