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The gas phase structures of CF3SO2F, CHF2SO2F, and CHF2SO2Cl have been studied by gas electron diffraction (GED) and quantum chemical calculations (HF/6-31G∗ and B3LYP/6-31G∗). The two compounds CHF2SO2X (X=F or Cl) exist in the gas phase as mixtures of trans and gauche conformers (C–H bond trans or gauche to S–X bond). In the case of CHF2SO2F the gauche conformer prevails (84(17)%), whereas for the...