C10H10N2O4S
254.26 g/mol
Dye & PigmentDanger
4-(3-Methyl-5-oxo-2-pyrazolin-1-yl)benzenesulphonic acid
CAS89-36-1EC201-901-3
Category
Dye & Pigment
Compound Class
Heterocycle
Primary Use
Pyrazolone dye intermediate
4-(3-Methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid is an organosulfur compound and a sulfonic acid derivative. It is primarily used as an intermediate in the production of pyrazolone dyes.
intermediate for pyrazolone dye synthesis
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
ReferenceSame Category
4-methyl-2-nitroaniline
CAS89-62-3
intermediate for dyes and pigments
ReferenceSame Category
4-chloro-2-nitroaniline
CAS89-63-4
Dye and pigment intermediate
ReferenceSame Category
2-anilino-3-methyl-6-(dibutylamino)fluoran
CAS89331-94-2
dye and pigment intermediate
ReferenceSame Category
O-anisidine
CAS90-04-0
intermediate for azo dyes synthesis
Referencesame scaffold
3-(3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid
CAS119-17-5
Dye and pigment intermediate
Referencesame scaffold
2,4-dihydro-5-methyl-2-(4-methylphenyl)-3H-pyrazol-3-one
CAS86-92-0
intermediate for dyes and pigments
Referencesame scaffold
Benzenesulfonic acid, 4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-3-methyl-
CAS118-07-0
pyrazolone sulfonic acid intermediate
Referencesame scaffold
1-(4'-Sulfophenyl)-3-carboxy-5-pyrazolone
CAS118-47-8
pyrazolone dye intermediate
Safety Reference
Danger
H314Causes severe skin burns and eye damage
H317May cause an allergic skin reaction
Customs Tariff Classification
The international HS code for 4-(3-Methyl-5-oxo-2-pyrazolin-1-yl)benzenesulphonic acid (CAS 89-36-1) is 2933.19.
HS code (international, 6-digit)
2933.19
EU CN code (8-digit)
2933 19 90
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-(3-methyl-5-oxo-4H-pyrazol-1-yl)benzenesulfonic acid
InChIKey
CWJQQASJVVAXKL-UHFFFAOYSA-N
SMILES
CC1=NN(C(=O)C1)C2=CC=C(C=C2)S(=O)(=O)O
Synonyms (13)
- Pyrazoline G
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