The coupling constants obtained from the 13C satellite spectra of benzodioxan show that the heterocyclic ring exists in the two rapidly inverting half-chair conformations. A consideration of the coupling constants in 1H n.m.r. spectra of some 2-substituted benzodioxans shows that a number of substituent groups prefer the pseudo-axial position.
M. J. Cook, A. R. Katritzky and M. J. Sewell, J. Chem. Soc. B, 1970, 1207 DOI: 10.1039/J29700001207
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