cis,trans-4,5-Diphenyl-1,3,2-dioxathiolane 2-Oxide, cis,cis-4,5-Diphenyl-1,3,2-dioxathiolane 2-Oxide and 4,4-Diphenyl-1,3,2-dioxathiolane 2-Oxide

All three title compounds, C₁₄H₁₂O₃S, adopt half-chair (envelope) conformations with the S=O group and the phenyl groups in pseudoaxial and pseudoequatorial positions, respectively. The steric effects of the phenyl groups are discussed in terms of S-O/C-O bond lengths and ring torsion angles.

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