p-Toluenesulfonic acid

CAS Registry Number®

104-15-4

CAS Name

p-Toluenesulfonic acid

Molecular Formula

C7H8O3S

Molecular Mass

172.20

Cite this Page

p-Toluenesulfonic acid.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/detail?cas_rn=104-15-4 (retrieved 2025-05-13) (CAS RN: 104-15-4).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Compound Properties

  • Boiling Point (1)

    140 °C @ Press: 20 Torr

  • Melting Point (1)

    106-107 °C

  • Density (2)

    1.24 g/cm³

Source(s)

  • (1) Hazardous Substances Data Bank data were obtained from the National Library of Medicine (US)
  • (2) International Chemical Safety Cards data were obtained from the National Institute for Occupational Safety and Health (US)

Other Names and Identifiers

InChI

InChI=1S/C7H8O3S/c1-6-2-4-7(5-3-6)11(8,9)10/h2-5H,1H3,(H,8,9,10)

InChIKey

InChIKey=JOXIMZWYDAKGHI-UHFFFAOYSA-N

SMILES

S(=O)(=O)(O)C1=CC=C(C)C=C1

Canonical SMILES

O=S(=O)(O)C1=CC=C(C=C1)C

Other Names for this Substance

  • Benzenesulfonic acid, 4-methyl-
  • 4-Methylbenzenesulfonic acid
  • p-Methylbenzenesulfonic acid
  • Tosic acid
  • p-Methylphenylsulfonic acid

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Deleted or Replaced CAS Registry Numbers

402-47-1, 51506-29-7, 100901-72-2, 114213-96-6, 119314-18-0, 126033-27-0, 128739-80-0, 144647-92-7, 156627-46-2, 185568-48-3, 210357-81-6, 227313-49-7, 369371-25-5, 613262-31-0, 1023356-14-0, 2756222-57-6, 2868312-36-9

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