J. Chem. Soc., Perkin Trans. 1, 1303 - 1309 (1983)
Chuen Li and Michael P. Sammes
Hydrogen bonds involving polar CH groups.
Part 9. Optimum structural parameters, and unequivocal demonstration of such intramolecular interactions in 2-substituted 1,3-dithian 1,1,3,3-tetraoxides
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http://dx.doi.org/10.1039/P19830001303