Abstract: Highlights • The structure and reactivity of the radical anions of perfluoroxylenes were analyzed. • The fragmentation probability was estimated for different C-F bonds. • The results explain why such products of perfluoroxylene defluorination were obtained. Abstract Оn the basis of a quantum chemical analysis of potential energy surfaces (PESs) of intermediate radical anions (RAs), we give a theoretical interpretation for the emergence of unusual products of the reductive deflourination of perfluorinated xylenes under the action of Zn(Cu)-DMF-H2O, observed by V.I. Krasnov et al in 1997: in the case of ortho- and meta-isomers, the fluorine atoms of the aromatic ring are replaced by hydrogen atoms, while the fluorine atoms of trifluoromethyl groups are retained. Using a hybrid model combining the supermolecular approach with the polarizable continuum model to consider the effects of solvation, we performed DFT calculations of the sections of the PESs mentioned along the coordinates of fluoride ion elimination from different positions of the RAs. The calculation results show that an outcome of the competition between the aryl and alkyl C-F bonds to be broken is determined by a ratio of the corresponding activation barriers.

Cite: Andreev R.V. , Beregovaya I.V. , Shchegoleva L.N.
Fragmentation of intermediate radical anions determines the main features of the hydrodefluorination of isomeric perfluoroxylenes. Quantum chemical substantiation
Journal of Fluorine Chemistry. 2022. V.257-258. P.109976. DOI: 10.1016/j.jfluchem.2022.109976 WOS РИНЦ

Dates:

Submitted:	Dec 30, 2021
Accepted:	Apr 3, 2022
Published online:	Apr 12, 2022

Identifiers:

Web of science	WOS:000797083500002
Elibrary	48428814
OpenAlex	W4223418812

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