Thioglycolic acid

Thioglycolic acid

CAS No.:68-11-1 Y
Properties
Molecular formula C2H4O2S 
Molar mass 92.11 g/mol 
Density: 1.32 g/cm3 
Melting point: -16 °C
Boiling point: 96 °C at 5 mmHg
Description
Thioglycolic acid (TGA) is the organic compound HSCH2CO2H. It contains both a thiol (mercaptan) and a carboxylic acid. It is a clear liquid with a strong unpleasant odor. It is readily oxidized by air to the corresponding disulfide [SCH2CO2H]2.
TGA was developed in the 1940s for use as a chemical depilatory and is still used as such, especially in the calcium thioglycolate salt form. TGA is the precursor to ammonium thioglycolate that is used for permanents. TGA and its derivatives break the disulfide bonds in the cortex of hair. One reforms these broken bonds in giving hair a "perm." Alternatively and more commonly, the process leads to depilation as is done commonly in leather processing
TGA is also used in the making of tin stabilizers often used in certain polyvinyl chloride products (such as vinyl siding).
TGA, usually as its dianion, forms complexes with metal ions. Such complexes have been used for the detection of iron, molybdenum, silver, and tin.

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