3-Methyl-1-(4-sulfophenyl)-2-pyrazolin-5-one

3-甲基-1-(4-磺酸苯基)-2-吡唑啉-5-酮

Also known as: 1-(4-Sulfophenyl)-3-methyl-5-pyrazolone, 1-(4-Sulphophenyl)-3-methyl-5-pyrazolone, 1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone, 1-(p-Sulfophenyl)-3-methyl-5-pyrazolone, 4-(3-Methyl-5-oxo-2-pyrazolin-1-yl)benzenesulfonic acid, 4-(3-Methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid, PSMP, SPMP, Pyrazolone G, 4-Pyrazolic acid, Phenylmethylpyrazole-4-acid

3-Methyl-1-(4-sulfophenyl)-2-pyrazolin-5-one (CAS 89-36-1) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C10H10N2O4S and a molecular weight of 254.262 g/mol. It is also known as 1-(4-Sulfophenyl)-3-methyl-5-pyrazolone, 1-(4-Sulphophenyl)-3-methyl-5-pyrazolone and 1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone. Key properties include a melting point of >252 °C (dec.)(lit.), a boiling point of 477ºC and a density of 1.5±0.1 g/cm3. GHS signal word: Danger. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

89-36-1

Jingsj CID

J-1993260-0

Molecular Formula

C₁₀H₁₀N₂O₄S

Chinese Name

3-甲基-1-(4-磺酸苯基)-2-吡唑啉-5-酮

Molecular Weight

254.262 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026