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IUPAC name
Carbonothioyl dichloride
Other names
Thiophosgene; Thiocarbonyl chloride; Carbonothioic dichloride
3D model (JSmol)
ECHA InfoCard 100.006.675 Edit this at Wikidata
RTECS number
  • XN2450000
  • InChI=1S/CCl2S/c2-1(3)4 checkY
  • InChI=1/CCl2S/c2-1(3)4
  • ClC(Cl)=S
Molar mass 114.98 g/mol
Appearance Red liquid
Odor Persistent, choking odor
Density 1.50 g/cm3
Boiling point 70 to 75 °C (158 to 167 °F; 343 to 348 K)
Solubility in other solvents polar organic solvents
rxn with amines and alcohols
-50.6·10-6 cm3/mol
planar, sp2, C2v
Main hazards Highly toxic
Flash point 62 °C (144 °F; 335 K)
Related compounds
Related compounds
Thiocarbonyl fluoride
Thiocarbonyl bromide
Sulfur dichloride
Thionyl chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Thiophosgene is a red liquid with the formula CSCl2. It is a molecule with trigonal planar geometry. There are two reactive C-Cl bonds that allow it to be used in diverse organic syntheses.[1]


CSCl2 is prepared in a two-step process from carbon disulfide. In the first step, carbon disulfide is chlorinated to give trichloromethanesulfenyl chloride (perchloromethyl mercaptan), CCl3SCl:

CS2 + 3 Cl2 -> CCl3SCl + S2Cl2

The chlorination must be controlled as excess chlorine converts trichloromethanesulfenyl chloride into carbon tetrachloride. Steam distillation separates the trichloromethanesulfenyl chloride, a rare sulfenyl chloride, and hydrolyzes the sulfur monochloride. Reduction of trichloromethanesulfenyl chloride produces thiophosgene:

CCl3SCl + M -> CSCl2 + MCl2

Typically, tin is used for the reducing agent M.[2]


CSCl2 is mainly used to prepare compounds with the connectivity CSX2 where X = OR, NHR.[3] Such reactions proceed via intermediate such as CSClX. Under certain conditions, one can convert primary amines into isothiocyanates. CSCl2 also serves as a dienophile to give, after reduction 5-thiacyclohexene derivatives. Thiophosgene is also known as the appropriate reagent in Corey-Winter synthesis for stereospecific conversion of 1,2-diols into olefins.[4]

It forms a head-to-tail dimer upon irradiation with UV light:[5]

2 CSCl2 -> S2(CCl2)2

Unlike thiophosgene monomer, a red liquid, the photodimer, an example of a 1,3-dithietane, is a colorless solid.

Safety considerations

CSCl2 is considered highly toxic.[]


  1. ^ Manchiu D. S. Lay, Mitchell W. Sauerhoff And Donald R. Saunders "Carbon Disulfide" in Ullmann's Encyclopedia Of Industrial Chemistry, 2000, Wiley-VCH, Weinheim. doi:10.1002/14356007.a05_185
  2. ^ Dyson, G. M. (1926). "Thiophosgene" (PDF). Organic Syntheses. 6: 86. doi:10.15227/orgsyn.006.0086.; Collective Volume, 1, p. 506
  3. ^ Pascual, Roxana Martinez "Thiophosgene" Synlett 2015, vol. 26, pp. 1776-1777. doi:10.1055/s-0034-1380659
  4. ^ Sharma, S. (1978). "Thiophosgene in Organic Synthesis". Synthesis. 1978 (11): 803-820. doi:10.1055/s-1978-24896.
  5. ^ B. Krebs H. Beyer (1969). "Die Kristall- und Molekelstruktur des dimeren Thiophosgens". Z. anorg. allg. Chem. 365: 199-210. doi:10.1002/zaac.19693650315.CS1 maint: uses authors parameter (link)

Further reading

  • Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, ISBN 0-12-352651-5

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.



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