Date published: 2026-4-1

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2-Toluenesulfonic acid (CAS 88-20-0)

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Alternate Names:
2-Methylbenzenesulfonic acid
CAS Number:
88-20-0
Molecular Weight:
172.2
Molecular Formula:
C7H8O3S
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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2-Toluenesulfonic acid, often abbreviated as TsOH, is a strong organic acid that is widely utilized in the field of organic synthesis. It acts as a catalyst in a variety of chemical reactions, such as esterifications and alkylations, due to its ability to donate protons effectively. In research applications, 2-Toluenesulfonic acid is used to study reaction mechanisms and kinetics, as it can influence the speed and direction of chemical transformations. Its non-oxidizing acid nature makes it a preferred catalyst for reactions sensitive to oxidation. Researchers also use 2-Toluenesulfonic acid in the synthesis of polymers, where it can initiate polymerization reactions or serve as a doping agent to modify polymer properties.


2-Toluenesulfonic acid (CAS 88-20-0) References

  1. Photooxidation products of polycyclic aromatic compounds containing sulfur.  |  Bobinger, S. and Andersson, JT. 2009. Environ Sci Technol. 43: 8119-25. PMID: 19924932
  2. Persistence and Mobility (defined as organic‑carbon partitioning) do not correlate to the detection of substances found in surface and groundwater: Criticism of the regulatory concept of Persistent and mobile substances.  |  Collard, M., et al. 2023. Sci Total Environ. 865: 161228. PMID: 36586701
  3. Fluorescence detection and determination of patulin by thin-layer chromatography of its aniline imine.  |  Young, JC. 1979. J Environ Sci Health B. 14: 15-26. PMID: 429758

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

2-Toluenesulfonic acid, 1 g

sc-482133
1 g
$312.00