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Thiodiglycol
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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 and polar . It is a colorless liquid. It is structurally similar to diethylene glycol.

Thiodiglycol is manufactured by reaction of 2-chloroethanol with .

Thiodiglycol is a polar protic solvent. It is used as a in a variety of applications ranging from dyeing to in some . In chemical synthesis, it is used as a building block for protection products, dispersants, , , rubber accelerators, , , and various other organic chemicals. In the manufacture of , it is used as a chain transfer agent. As an , it is used as an additive in .

Thiodiglycol is used as a in . The ability to vary the 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).

Thiodiglycol is a Chemical Weapons Convention schedule 2 chemical used in the production of sulfur-based . Thiodiglycol is also a product of the of the "mustard gas" bis(2-chloroethyl)sulfide and can be detected in the of casualties.


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