Evidence based mainly on nuclear magnetic resonance spectra suggests that the deep red species produced by the addition of tertiary amines to solutions of 1,3,5-trinitrobenzene in certain ketones are sigma-complexes formed by the nucleophilic attack of the conjugate base of the ketone on 1,3,5-trinitrobenzene.
R. Foster and C. A. Fyfe, J. Chem. Soc. B, 1966, 53 DOI: 10.1039/J29660000053
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