Chlorination of CS leads to trichloromethanesulfenyl chloride, Cl CSCl, in moderate yields. The oxidation of Cl CSCl with H O gives Cl CSO Cl, the chloride of trichloromethanesulfonic acid. Cl CSO Cl is the crucial product for the preparation of trichloromethanesulfonates ("trichlates") and has been characterized by IR spectroscopy, differential scanning calorimetry (DSC) and X-ray diffraction measurements (P-1, a=609.99(5) pm, b=727.45(6) pm, c=782.49(7) pm, α=80.644(3)°, β=85.175(3)°, γ=88.311(3)°. The acid Cl CSO H can be gained in form of the hydrate (H O )[Cl CSO ] in two different modifications (I: monoclinic, P2 /n, Z=8, a=1292.47(7) pm, b=605.89(2) pm, c=2661.1(1) pm, β=98.708(4)°, V=1672.8(1) Å ; II: monoclinic, Cc, Z=4, a=699.80(5) pm, b=1054.72(8) pm, c=1139.88(8) pm, β=95.303(3)°, V=837.7(1) Å . Both modifications have been investigated by IR spectroscopy, thermal analyses and theoretical calculations.
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