1,3λ4δ2,5,2,4-Trithiadiazepine (1) and its benzo derivative (2) have planer delocalised 10π and 14π aromatic structures, respectively; in the dihydro compound (3) the five heteroatoms are co-planer, with the approximately cis and trans periplaner methylene protons rapidly interconverting.
R. Jones, J. L. Morris, A. W. Potts, C. W. Rees, D. J. Rigg, H. S. Rzepa and D. J. Williams, J. Chem. Soc., Chem. Commun., 1985, 398 DOI: 10.1039/C39850000398
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