C7H8O3S
172.2 g/mol
Industrial ChemicalWarning
4-Methylbenzenesulfonic acid
CAS104-15-4EC203-180-0
Category
Industrial Chemical
Compound Class
Organic Acid
Primary Use
Acid catalyst for chemical synthesis
4-Methylbenzenesulfonic acid is an organic compound that appears as a colorless to black solid and is odorless or nearly odorless. It is commonly used as an acid catalyst in chemical synthesis and in various industrial applications such as metal cleaning and electroplating.
Acid catalyst for chemical synthesisAcid and alkali cleaning of metalsElectroplating
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
StrongSame Parent
(R)-(+)-Tetrahydro-3-furylamine p-toluenesulfonate salt
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pharmaceutical intermediate
StrongSame Parent
2-Aminomalononitrile 4-methylbenzenesulphonate
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research compound
StrongSame Parent
P-toluenesulfonic acid monohydrate
CAS6192-52-5
Catalyst in organic synthesis
ReferenceSame Category
Benzene, 1,4-dibutoxy-
CAS104-36-9
chemical intermediate for dyes and pigments
ReferenceSame Category
2,2'-(p-phenylenedioxy)diethanol
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Adhesion/cohesion promoter
ReferenceSame Category
1,4-diisocyanatobenzene
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Polyurethane intermediate
ReferenceSame Category
2-ethylhexylamine
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Production of pharmaceuticals and chemicals
Referencestereoisomer of
Pyridinium p-toluenesulfonate
CAS24057-28-1
research compound
Safety Reference
Warning
H315Causes skin irritation
H319Causes serious eye irritation
H335May cause respiratory irritation
H314Causes severe skin burns and eye damage
H318Causes serious eye damage
H302Harmful if swallowed
H371May cause damage to organs
Customs Tariff Classification
The international HS code for 4-Methylbenzenesulfonic acid (CAS 104-15-4) is 2904.10.
HS code (international, 6-digit)
2904.10
EU CN code (8-digit)
2904 10 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
4-methylbenzenesulfonic acid
InChIKey
JOXIMZWYDAKGHI-UHFFFAOYSA-N
SMILES
CC1=CC=C(C=C1)S(=O)(=O)O
Synonyms (68)
- C-250
- PTSA
- TSA-HP
- TSA-MH
- TSU
- Toluene-4-Sulfonic Acid; Anastrozole EP Impurity F; Tizanidine EP Impurity I; Sultamicillin EP Impurity B; Lisinopril EP Impurity B; Escitalopram EP Impurity J
- Xylometazoline EP Impurity E
- 4-Methylbenzenesulfonic acid
- 4-Toluenesulfonic acid
- 4-methylbenzenesulphonic acid
- 4-methylphenylsulfonic acid
- 4-methylphenylsulphonic acid
- 4-sulphotoluene
- 4-toluenesulphonic acid
- ANASTROZOLE IMPURITY F
- Benzenesulfonic acid, methyl-
- Cyclophil P T S A
- Cyzac 4040
- Eltesol
- Eltesol TSX
- K-Cure 040
- K-Cure 1040
- Kyselina p-toluenesulfonova
- Kyselina p-toluensulfonova
- LISINOPRIL IMPURITY B
- Manro PTSA 65 E
- Manro PTSA 65 H
- Manro PTSA 65 LS
- Methylbenzenesulfonic acid
- Nacure 1040
- P-TOLUENESULFONIC ACID
- PARA-TOLUENE SULFONATE
- SULTAMICILLIN IMPURITY B
- Toluene-4-sulfonic acid
- Toluene-4-sulphonic acid
- Toluene-p-sulfonate
- Toluenesulfonic acid
- Toluenesulfonic acid (VAN)
- TosOH
- Tosic acid
- Tosylic acid
- Ts-OH
- ar-Toluenesulfonic acid
- p-Methylbenzenesulfonic acid
- p-Methylphenylsulfonic acid
- p-Toluene sulfonate
- p-Toluenesulphonic acid
- p-Toluolenesulfonic acid
- p-Tolylsulfonic acid
- p-toluenesufonic acid
- p-toluenesuiphonic acid
- p-toluenesulfonic acid (ptsa)
- p-toluensulfonic acid
- p-toluensulphonic acid
- p-toluenylsulfonic acid
- p-toluyl sulphonic acid
- pTsOH
- para-toluenesulfonic acid
- para-toluenesulphonic acid
- paratoluensulfonic acid
- rho-toluenesulfonic acid
- toluene p-sulphonic acid
- toluene-p-sulfonic acid
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