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2,2'-thiodiethanol 200.svg
IUPAC name
Other names
2,2'-Thiodiethanol, β,β'-dihydroxydiethyl sulfide, β-thiodiglycol, thiodiethylene glycol, β-hydroxyethyl sulfide, 2-hydroxyethyl sulfide, bis(β-hydroxyethyl)sulfide, Glyecine A, Kromfax Solvent, Tedegyl
3D model (JSmol)
ECHA InfoCard 100.003.523
Molar mass 122.19 g/mol
Appearance colorless liquid
Melting point −16 °C (3 °F; 257 K)
Boiling point 165 °C (329 °F; 438 K) at 14 mmHg (1.9 kPa) or decomposition at 282 °C at normal pressure
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

Thiodiglycol, or bis(2-hydroxyethyl)sulfide (also known as 2,2-thiodiethanol or TDE), is the organosulfur compound with the formula S(CH2CH2OH)2. It is miscible with water and polar organic solvents. It is a colorless liquid. Thiodiglycol is manufactured by reaction of 2-chloroethanol with sodium sulfide. It is structurally similar to diethylene glycol.

Thiodiglycol has both polar and nonpolar solvent properties. It is used as a solvent in a variety of applications ranging from dyeing textiles to inks in some ballpoint pens. In chemical synthesis, it is used as a building block for protection products, dispersants, fibers, plasticizers, rubber accelerators, pesticides, dyes, and various other organic chemicals. In the manufacture of polymers, it is used as a chain transfer agent. As an antioxidant, it is used as an additive in lubricants.

Thiodiglycol is used as a mounting medium in microscopy. The ability to vary the refractive index of the medium by varying the concentration of TDE in an aqueous solution, plus its relative lack of toxicity makes it highly desirable for such use. The refractive index of the solution can be varied anywhere from near that of water (1.333) to that of glass (1.518).[1]

Thiodiglycol is a Chemical Weapons Convention schedule 2 chemical used in the production of sulfur-based blister agents such as mustard gas. Thiodiglycol is also a product of the hydrolysis of mustard gas. It can be detected in the urine of casualties.


  1. ^ Staudt T; et al. (2006). "2,2′-Thiodiethanol: A new water soluble mounting medium for high resolution optical microscopy". Microscopy Research and Technique. 70: 1–9. doi:10.1002/jemt.20396.

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