Sulfuryl chloride
| Sulfuryl chloride | |
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Sulfuryl chloride |
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Other names
Sulfonyl chloride |
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| Identifiers | |
| CAS number | 7791-25-5  |
| PubChem | 24648 |
| ChemSpider | 23050 |
| EC number | 232-245-6 |
| ChEBI | CHEBI:29291 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | SO2Cl2 |
| Molar mass | 134.9698 g mol−1 |
| Appearance | Colorless liquid with a pungent odor. Yellows upon standing. |
| Density | 1.67 g cm−3 (20 °C) |
| Melting point |
−54.1 °C, 219.1 K |
| Boiling point |
69.4 °C, 342.6 K |
| Solubility in water | hydrolyzes |
| Solubility | miscible with benzene, toluene, chloroform, CCl4, glacial acetic acid |
| Refractive index (nD) | 1.4437 (20 °C) [1] |
| Hazards | |
| EU Index | 016-016-00-6 |
| EU classification | Corrosive (C) |
| R-phrases | R14, R34, R37 |
| S-phrases | (S1/2), S26, S30, S45 |
| NFPA 704 |
 0
3
2
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| Flash point | Not flammable |
| Related compounds | |
| Related sulfuryl halides | Sulfuryl fluoride |
| Related compounds | Thionyl chloride Chlorosulfonic acid Sulfuric acid |
 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Sulfuryl chloride is an inorganic compound with the formula SO2Cl2. At room temperature, it is a colorless liquid with a pungent odor. Sulfuryl chloride is not found in nature, as can be inferred from its rapid hydrolysis.
Sulfuryl chloride is commonly confused with thionyl chloride, SOCl2. The properties of these two sulfur oxychlorides are quite different: sulfuryl chloride is a source of chlorine whereas thionyl chloride is a source of chloride ions. An alternative IUPAC name is sulfuroyl dichloride.
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Structure [edit]
Sulfur is tetrahedral in SO2Cl2, being bound to two oxygen atoms via bonds intermediate of a dative bond and a polarized double bond (which does not utilize d-orbitals[2]) and to two chlorine atoms via polarized single bonds. The oxidation state of the sulfur atom is +6, as in H2SO4.
Synthesis [edit]
SO2Cl2 is prepared by the reaction of sulfur dioxide and chlorine in the presence of a catalyst, such as activated carbon.
- SO2 + Cl2 → SO2Cl2
The crude product can be purified by fractional distillation. It is uncommon to prepare SO2Cl2 in the laboratory because it is commercially available. Sulfuryl chloride can also be considered a derivative of sulfuric acid.[3]
Reactions [edit]
Sulfuryl chloride reacts with water, releasing hydrogen chloride gas and sulfuric acid:
- 2 H2O + SO2Cl2 → 2 HCl + H2SO4
SO2Cl2 will also decompose when heated to or above 100 °C, about 30 °C above its boiling point.
Upon standing, SO2Cl2 decomposes to sulfur dioxide and chlorine, which gives the older samples a slightly yellowish color.
Uses [edit]
Sulfuryl chloride is often used as a source of Cl2. Because it is a pourable liquid, it is considered more convenient than Cl2 to measure, store, and dispense. SO2Cl2 is widely used as a reagent in the conversion of C-H → C-Cl adjacent to activating substituents such as carbonyls and sulfoxides. It also chlorinates alkanes, alkenes, alkynes, aromatics, and epoxides. Such reactions occur under free radical conditions using an initiator such as AIBN. It can also be used to convert disulfides into their corresponding sulfenyl chlorides. SO2Cl2 can also convert alcohols to alkyl chlorides. In industry, sulfuryl chloride is most used in producing pesticides.
SO2Cl2 can also be used to treat wool to prevent shrinking.
Precautions [edit]
SO2Cl2 is toxic, corrosive, and acts as a lachrymator. It can form explosive mixtures with water, as well as donor solvents such as DMSO and DMF.
References [edit]
- ^ Patnaik, P. (2002). Handbook of Inorganic Chemicals. McGraw-Hill. ISBN 0-07-049439-8.
- ^ Terence P. Cunningham , David L. Cooper , Joseph Gerratt , Peter B. Karadakov and Mario Raimondi (1997). "Chemical bonding in oxofluorides of hypercoordinatesulfur". Journal of the Chemical Society, Faraday Transactions 93 (13): 2247–2254. doi:10.1039/A700708F.
- ^ Hogan, C. M. (2011). "Sulfur". In Jorgensen, A.; Cleveland, C. J. Encyclopedia of Earth. Washington DC: National Council for Science and the Environment.
- "Sulfuryl chloride CAS N°: 7791-25-5" (pdf). OECD SIDS. UNEP Publications. 2004.
- Maynard, G. D. (2001). "Sulfuryl Chloride". Encyclopedia of Reagents for Organic Synthesis. John Wiley & Sons. doi:10.1002/047084289X.rs140.
Further reading [edit]
- Lautens, M.; Bouchain, G. (2002), "[4+3] Cycloaddition in Water. Synthesis of 2,4-endo,endo-Dimethyl-8-Oxabicyclo[3.2.1]oct-6-en-3-one", Org. Synth. 79: 251; Coll. Vol. 10: 336
- Mckee, R. H.; Salls, C. M. (1924). "Sulfuryl Chloride". Ind. Eng. Chem. 16 (4): 351–353. doi:10.1021/ie50172a008.
