Dipole moments and n.m.r. data for 1,3-dithian 1-oxide, its 2,2-dimethyl derivative, and certain conformationally rigid 1,3-dithian 1-oxides are reported. The results, together with u.v. data for 1,3-dithian 1-oxide and its cis-and trans-2-t-butyl derivatives, demonstrate that the mobile compounds exist predominantly as the conformer with the S![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
O bond equatorial. The direction of the sulphoxide dipole moment is discussed.
M. J. Cook and A. P. Tonge, J. Chem. Soc., Perkin Trans. 2, 1974, 767 DOI: 10.1039/P29740000767
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