1-(2-Chloro-5-sulfophenyl)-3-methyl-5-pyrazolone

1-(2-氯-5-磺酸基苯基)-3-甲基-5-吡唑啉酮

Also known as: 1-(2'-Chloro-5'-sulfophenyl)-3-methyl-5-pyrazolone, 1-(2-Chloro-5-sulfophenyl)-3-methyl-2-pyrazolin-5-one, 4-Chloro-3-(3-methyl-5-oxo-2-pyrazolin-1-yl)benzenesulfonic acid, 4-Chloro-3-(3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid, 4-Chloro-3-(3-methyl-5-oxo-2,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid, Benzenesulfonic acid, 4-chloro-3-(3-methyl-5-oxo-2-pyrazolin-1-yl)-, Benzenesulfonic acid, 4-chloro-3-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-, Chloropyrazolic acid, NSC 26425, EINECS 201-858-0, MFCD00020745, 556874_ALDRICH

1-(2-Chloro-5-sulfophenyl)-3-methyl-5-pyrazolone (CAS 88-76-6) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C10H9ClN2O4S and a molecular weight of 288.707 g/mol. It is also known as 1-(2'-Chloro-5'-sulfophenyl)-3-methyl-5-pyrazolone, 1-(2-Chloro-5-sulfophenyl)-3-methyl-2-pyrazolin-5-one and 4-Chloro-3-(3-methyl-5-oxo-2-pyrazolin-1-yl)benzenesulfonic acid. Key properties include a melting point of 344 °C(lit.) and a density of 1.6±0.1 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

88-76-6

Jingsj CID

J-1993271-2

Molecular Formula

C₁₀H₉ClN₂O₄S

Chinese Name

1-(2-氯-5-磺酸基苯基)-3-甲基-5-吡唑啉酮

Molecular Weight

288.707 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026