Toluene sulfonic acid is a chemical compound, a non-oxidising organic acid soluble in water, alcohol, ether and other solvents, insoluble in benzene and toluene.

What it is used for and where
It is commonly used as an acid catalyst in organic synthesis, catalysing agent in the synthesis of pharmaceuticals, polymerisation stabiliser and organic synthesis.

Cosmetics
Hydrotrope (solubilizing agents). This compound has the property of facilitating the miscibility of other compounds that are poorly soluble in water and does not form micelles in the solubilisation process, even with a chemical reaction of complexation or molecular aggregation. The two fundamental solubilisation factors are the hydrotropic-solute association mediated by the depression of water activity and ionic dissociation.
Synonyms: Benzenesulfonic acid, 4-methyl-
4-methylbenzenesulfonic acid
Tosic acid
Trade name:Eltesol TSX

CAS: 104-15-4 25231-46-3