CAS Number: 104‑15‑4 (anhydrous) / 6192‑52‑5 (monohydrate)
Synonyms: p‑Toluenesulfonic acid; Tosylic acid; PTSA; TsOH; para‑toluenesulphonic acid
Chemical Formula:C₇H₈O₃S (monohydrate adds H₂O)
Molecular Weight:172.20 g/mol (anhydrous); ~190.22 g/mol (monohydrate)
Product Introduction
A white, strongly hygroscopic crystalline solid. p‑TsOH is a strong organic acid (~100 000× stronger than benzoic acid) used as a solid acid catalyst in esterifications, dehydrations, polymerization, and as a pH adjuster in pharmaceutical and fine chemical transformations.
| Property | Value |
|---|---|
| Appearance | White crystalline powder (monohydrate) |
| Melting Point | 38 °C (anhydrous); 105–107 °C (monohydrate) |
| Boiling Point | ~140 °C @ 20 mmHg |
| Density | ~1.24 g/cm³ |
| Solubility | ~67 g/100 mL H₂O; soluble in alcohols, polar solvents |
| Refractive Index (n₂₀ᴅ) | ~1.3825–1.3845 |
| pKₐ | –2.8 (strong sulfonic acid) |
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