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Proton magnetic non-equivalence in the 1,3,5-trinitropentadienide system of certain Meisenheimer complexes

1970; Royal Society of Chemistry; Linguagem: Inglês

10.1039/j29700000147

2050-5590

Michael Foreman, Robert J. Foster, Miass Strauss,

Molecular spectroscopy and chirality

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.