Issue 20, 2019

σ-Holes promote the concertedness in nucleophilic aromatic substitution reactions of nitroarenes

Abstract

The mechanism of the SNAr reactions between 1-halo-2,4-dinitrobenzenes and amines was revisited by means of DFT calculations. Remarkably and contrary to the traditional text-book perspective, the dehalogenation of 1-X-2,4-dinitrobenzenes bearing good leaving groups (X = Cl, Br and I) by soft nucleophiles involves a single-step mechanism passing through a barrierless C–X bond cleavage step. Solely the reaction of 1-fluoro-2,4-dinitrobenzene follows the traditional addition–elimination pathway. The analysis of the charge transfer patterns along the reaction path for the whole systems studied suggests that for those nitroarenes exhibiting σ-holes the dehalogenation mechanism occurs through a single-step. Nucleophile effects on the reaction rates were also discussed.

Graphical abstract: σ-Holes promote the concertedness in nucleophilic aromatic substitution reactions of nitroarenes

Supplementary files

Article information

Article type
Paper
Submitted
21 Mar 2019
Accepted
24 Apr 2019
First published
26 Apr 2019

New J. Chem., 2019,43, 7763-7769

σ-Holes promote the concertedness in nucleophilic aromatic substitution reactions of nitroarenes

S. Gallardo-Fuentes and R. Ormazábal-Toledo, New J. Chem., 2019, 43, 7763 DOI: 10.1039/C9NJ01493D

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