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Photochemical Nitration by Tetranitromethane. Part XIX. The Competitive Reactions of Trinitromethanide and Nitrogen Dioxide with Radical Cations and their Use for Selective Nitrations

DOI: 10.1039/P29940001719

Source and publish data:

Journal of the Chemical Society. Perkin transactions II p. 1719 - 1730 (1994)

Update date:2022-08-29

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Authors:

Eberson, LennartEberson, Lennart

Hartshorn, Michael P.Hartshorn, Michael P.

Radner, FinnRadner, Finn

Svensson, Jan O.Svensson, Jan O.

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Article abstract of DOI:10.1039/P29940001719

The photolysis of the charge-transfer complex between an aromatic compound (ArH) and tetranitromethane is known to form initially a triad of the aromatic radical cation, trinitromethanide ion and NO2 .For reactive and moderately reactive radical cations, the chemical follow-up ion and (i) reactions from the species of the triad are fast at -60 deg C, as shown by the fact that the solutions are EPR-silent during photolysis.However, by conducting the photolysis in the presence of a protic acid, the trinitromethanide ion is rendered unreactive by protonation, resulting in the build-up of a detectable (EPR) concentration of ArH-radical cation or (ArH)2-radical cation.This shows that the initial chemical step from the triad is the nucleophilic attack of trinitromethanide ion upon ArH-radical cation, and that the rate of the reaction between the latter and NO2 must be significantly lower.Preparative experiments support this conclusion, in that the predominant adduct formation from ArH-tetranitromethane photolysis is diverted into nitro substitution in the presence of a protic acid, the latter reaction occurring via ArH-radical cation-NO2 coupling.These findings also establish that results obtained from the photonitration of aromatics by tetranitromethane are not relevant for judging the possible electron transfer nature of electrophilic aromatic nitration by nitronium ion.

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