Para-Toluene Sulfonyl Chloride is an aromatic sulfonyl chloride compound with the chemical formula C₇H₇ClO₂S. It consists of a benzene ring substituted with a methyl group (–CH₃) and a sulfonyl chloride group (–SO₂Cl) in the para (4-) position, which gives it distinct chemical reactivity.
It is a highly reactive intermediate widely used in organic synthesis, particularly for introducing the tosyl (–SO₂–C₆H₄CH₃) group into molecules. This makes it valuable for modifying alcohols and amines, often converting them into better leaving groups (tosylates) for further chemical reactions.
 
 
Applications: Used as a tosylating agent in organic synthesis for converting alcohols and amines into reactive intermediates (tosylates). Widely used in the production of pharmaceuticals, dyes, agrochemicals, and specialty chemicals, as well as in polymer and resin modification.
Appearance:  White to off-white crystalline solid
Solubility:  Insoluble in water
pH Range: Not applicable
Chemical Formula: C₇H₇ClO₂S
Cas. No: 98-59-9