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Anions involved in the initiation of the thermally induced SRN1 reaction for α-arylation of ketones

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Abstract

The SRN1 reaction between acetophenone enolate and PhI is thermally induced and accelerated by microwave irradiation to give the corresponding substitution product 1,2-diphenylethanone in a 50% yield in DMSO at 70 °C. Regarding the mechanism of initiation, in this reaction, acetophenone enolate, tert-butoxyde anion and dimsyl anion (the ionic form of the solvent) could promote the initial electron transfer to start the radical reaction. Comparative studies on the PhI dehalogenation promoted by the different anions were conducted in DMSO under microwave irradiation and by quantum calculations. The dimsyl anion shows a higher iodide generation even at lower concentrations than acetophenone enolate and tBuO. Likewise, DFT calculation by B3PW91, M062X and PBE0 shows the dymsyl anion to be the best electron donor. While the three anions can initiate the radical reaction, the reactivity order found locates the dimsyl anion in first place, followed by the enolate of acetophenone and then the alkoxide. The results reported herein allow a greater understanding of the initiation process with tert-butoxide solutions in DMSO.

Graphical abstract: Anions involved in the initiation of the thermally induced SRN1 reaction for α-arylation of ketones

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Article information


Submitted
07 May 2017
Accepted
07 Jun 2017
First published
19 Jun 2017

This article is Open Access

RSC Adv., 2017,7, 31148-31157
Article type
Paper

Anions involved in the initiation of the thermally induced SRN1 reaction for α-arylation of ketones

D. A. Caminos, M. Puiatti, J. I. Bardagí and A. B. Peñéñory, RSC Adv., 2017, 7, 31148
DOI: 10.1039/C7RA05156E

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