Disulfuryl chloride
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Other names
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3D model (JSmol)
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PubChem CID
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| UNII | |
| UN number | 1817 (PYROSULFURYL CHLORIDE) |
CompTox Dashboard (EPA)
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| Properties | |
| Cl2O5S2 | |
| Molar mass | 215.02 g·mol−1 |
| Appearance | colorless liquid |
| Density | 1.84 g/cm3 |
| Melting point | –37 °C |
| Boiling point | 152.5 °C |
| reacts with water | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Disulfuryl chloride is an inorganic compound of sulfur, chlorine, and oxygen with the chemical formula S2O5Cl2.[1] This is the anhydride of chlorosulfuric acid.
Synthesis
[edit | edit source]Careful heating of sulfur trioxide and carbon tetrachloride:[2]
- 2SO3 + CCl4 → S2O5Cl2 + COCl2
There are also other known methods that do not produce phosgene as a by-product, for example mixing sulfur trioxide and sulfuryl chloride:
- SO3 + SO2Cl2 → S2O5Cl2
Physical properties
[edit | edit source]The compound appears as a dense, very refractive, colorless liquid with a pungent odor, insoluble in cold water, and prone to hydrolysis.[3][4] Its tendency to smoke in air is low when the compound is pure, while the smoke increases with the presence of chlorosulfuric acid impurities, which are more prone to hydrolysis.
Chemical properties
[edit | edit source]It slowly drools on contact with water:[5]
- S2O5Cl2 + 3H2O → 2H2SO4 + 2HCl↑
Prolonged boiling or heating to 250 °C (482 °F) results in dissociation into sulfur trioxide, sulfur dioxide, and chlorine.[2]
Uses
[edit | edit source]The compound is used in organic synthesis and as a chlorinating agent.[5]
See also
[edit | edit source]References
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