N.m.r. spectra have been recorded for a series of asymmetrical Meisenheimer complexes of 1,3,5-trinitrobenzene. In certain of the complexes the protons of the 1,3,5-trinitropentadienide system show a chemical shift difference of about 0·1 p.p.m. It is argued that such a chemical shift difference reflects the existence of hindered rotations.
M. I. Foreman, R. Foster and M. J. Strauss, J. Chem. Soc. B, 1970, 147 DOI: 10.1039/J29700000147
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